In order to edit or add to a tenants contact profile, you will want to go to their Lease - Details tab, either on the Properties or Accounting page.

Next select the tenant's information tab to expand that. From here you can click on the three dot menu on the right side to edit any of this information. Then click Save on the bottom right when you are done.

The newly updated information will now display under the tenants profile anywhere in the system, such as when you click the arrow next to their name.