To work with the Access tab, you should have the following access rights:

• View detailed object properties. To the account.
• Manage access to this object. To the account.
• Manage user's access rights. To the user to whom you want to grant access rights to the account.

On this tab, you can see and change the access rights of users to the account.

In the left part of the window, you can see the list of users to whom you can grant access rights to the account. The names of the users who have at least one of these rights are highlighted in color.

In the right part of the window, you can see the access rights to the account that you can grant to the user. The rights are divided into two types: standard and special.

Read about granting access rights here.