To manage user access to the internal Web site
1.Open the Windows SBS Console.
2.On the navigation bar, click Shared Folders and Web Sites, click the Web Sites tab, and then click Internal Web Site.
3.In the Internal Web site Tasks, click Manage permissions. The Internal Web site Properties page appears.
4.Click the Permissions tab.
5.In the drop-down list, select the Windows security group that is associated with the Windows SharePoint Services role that you want to manage the membership for (for example, SharePoint_MembersGroup), and then click Modify. The Change Group Membership dialog box appears.
6.In the Users and Groups column, select the user to whom you want to grant access.
Note
To select multiple users, press CTRL, and then click each user or group that you want to select.
7.Do one of the following:
To grant access to the selected users, click Add, and then click OK.
To deny access to the selected users, click Remove, and then click OK.
8.Repeat steps 5 through 7 if you want to change the membership of another Windows SharePoint Services role.
9.Click Apply, and then click OK to close the Internal Web site Properties page.
Note
This procedure changes the membership of the Windows security group that is associated with each Windows SharePoint Services role. If you manage Windows SharePoint Services roles directly by using the Windows SharePoint Services administration tools, those changes do not appear in the Windows SBS Console. It is recommended that you manage the Windows SharePoint Services access permissions by using the Windows SBS Console.
This is from
http://technet.microsoft.com/en-us/library/cc546018(WS.10).aspx
