You can assign permissions to groups and/or users. Users in a group will receive the permissions assigned to the group, plus any permissions you assign them individually as well.
 
After clicking the Permissions link on either the user list or group list, you will be taken to the Permissions form. The permissions are divided into types according to the areas of the store and admin area that they control. Select all the permissions you wish to assign to the user or group and click Set Permissions to save your settings. The types of permissions are:
 

1. Access Keys – This allows you to assign access keys to user(s) without having to create a membership for them.
2. Access Admin – Permissions related to site and admin access
3. Category Admin – Creating and editing categories
4. Feature Admin – Creating, editing and approving features
5. Page Admin – Creating and editing store pages and menus
6. Product Admin – Creating and editing products and product-related functions like discounts and promotions.
7. Shopping Admin – Shopping-related settings and all the various order admin permissions
8. Users Admin – Main site administration and user admin settings

 
 
Here’s some more information on each of the individual permissions available for each of these sections:
 

Access Admin 

1. Assign Permissions – Ability to assign permissions to groups and users
2. Manage Access Keys – Ability to set up and edit access keys
3. Manage Memberships – Create and edit memberships

Category Admin

1. Category Admin – Create and edit categories, view admin links on category pages

Feature Admin

1. Feature Admin – Create and edit your own features. Cannot approve features for viewing on the website but can view all features.
2. Feature Editor – View all features, admin links on feature pages in the store, approve features for viewing on the site.
3. Feature Author – Can add features, but cannot approve them.
4. Feature Reviews – Access to change review settings, and to approve and edit reviews.

Page Admin

1. Page Admin – Create and edit store pages and menus. Shows the admin links on pages and menus

Product Admin

1. Full Product Admin – Has full access to create and edit all products in the store.
2. User Products Admin – This is a special, limited-access product admin. They can create products, but will only have access to products they have created themselves. Their product images and files will be saved into a separate directory, they will not be able to view or use other user’s files. They will also need to create and modify their own standard options and addons.
3. Discount Admin – Ability to create and modify store discounts.
4. Promotion Admin – Ability to create and modify store promotions.
5. Product Import – Access to the product import function for adding products to the store.
6. Product Export – Access to the product export function.
7. Product Reviews– Access to change review settings, and to approve and edit reviews.
8. Site Feeds – Access to the functions for exporting site feeds (Google, Bizrate, etc.)

Shopping Admin

1. Cart Admin – Access to set all the settings related to shopping: Shopping Cart Settings, Payment Settings, Shipping Settings, Tax Settings
2. Order Access – This is the basic permission for the order processing area. All the other order permissions should have this one as well.
3. Gift Certs Admin – Ability to create gift certificate codes.
4. Order Approve – View the Pending Orders and can approve them for shipping, print invoices, etc.
5. Order Process – View the In Process tab, can fill orders and print packing lists and invoices
6. Order Dropship – View the dropshipping tab, can edit and fill purchase orders and fill orders.
7. Order Edit – Edit the basket on an order, can change the payment and shipping status of the order, view the billing tab if enabled
8. Order Reports – Access to filled orders and the order reports
9. Order Search – Access to the order search tab
10.  Gift Registry Admin – Ability to set gift registry settings, view, add and modify store registries.
11. Place Orders as Customer – Access to the Login As Another User function, to place orders as an existing customer.

 
 User Admin
 

1. Site Admin – Main Settings, palettes, store templates, pick lists
2. Admin Menu – Gives the user access to the admin menu, sections shown according to the rest of their permissions. Generally this is on for all store admin users.
3. Group & User Admin – Ability to set up and edit users and groups
4. User Export – Access to the user export functions

 
Click Update Permissions to save your permission settings for this user/group.