Add an additional admin user in Magento

1. In your magento admin backend, go to Admin> System> Permissions> Users.
2. Click “Add new user”
3. Enter the user’s information.
4. Be sure to click on the “user roles” tab on the left menu to assign the account to a role. (You can create more limited-capability roles using ADMIN> System> Permissions> Roles so that users can’t reset anything too deadly if you want.)
5. Save user.