You must first add the field to the form in order to include the client's address:
Go to the "Setup".
Click on the "Custom Fields".
Enable the Address, as shown below:
4. Go to the "Clients".
5. You must select the client, whom you need to add the address.
6. Click on the three dots(...).
7. Click on the "Edit".
8. Add the "Address", Click on the "Save".
Adding a new client also allows you to include the address.