If you are using MORI Classic, please reference this article: https://moriapp.zendesk.com/hc/en-us/articles/115002705888
In M2, the edit button is now a little "pencil" shape in the upper right corner of the boxes. Generally wherever you see that pencil, you'll be able to make changes.
Then you click "edit" in the contact info that you want to change.
Under the edit for the address, you'll be able to mark an address invalid.
We hope these features save you time and make your role as secretary or office staff easier and more time efficient!