To change the existing permissions for a user already on the Access List, follow these steps:
Click SELECT on the user name in the scrolling list.
If you want to change several users at one time, click SELECT on each additional user name you want to change.
Select the new permissions you want to give the user.
In Figure 5-30, Browse and Insert are selected to replace the existing permission of Insert forsalmon@sea.
Click SELECT on Add Name from the Calendar menu or the scrolling list pane menu.
Add Name is used to add a new user, and it's also used to change the access permissions of an existing user.
Click SELECT on the Apply button to record the changes.