You can edit other people's accesses at any time in the Unloc app on your mobile phone. If you are on the board in the condominium, you can log in to the control panel to remove access.
Step 1: Click on the key you want to edit the access to, and you will immediately get a list of who currently has access.
Step 2: Select who you want to remove access from, then click "Delete Key". The person will immediately lose access to the lock.