1. In Administration, select System Options.
2. Open Pages and set the Authorization Failed Page.

v. 6.15
1. Log into Blackbaud NetCommunity as a supervisor user
2. Navigate to Administration -> Sites
3. Select the Site from the left column
4. Select the Settings tab
5. Scroll down to Pages
6. Choose the Authorization Failed Page from the drop down
7. Select the Save button at the top of the page to save your changes