1. Core > People Finder > select the user
2. Access tab > Disconnect Blackbaud ID account
3. Confirm you want to proceed
4. Edit the user's username (or leave it as their email address) and set a temp password if the user needs to authenticate through the ON Products
5. Remove the user from any BBID enabled roles or they will continue to be redirected to link their account to a BBID each time they sign in. 

If you want to prevent the user from logging, lock or disable their account from the Access tab.

Note: Removing a user from their BBID enabled role(s) alone will not prevent the user from authenticating with BBID. Their Blackbaud ID account must be disconnected as outlined above.