I would like to edit my customers information on the app .Cant find way to do it

I can show you how to update the information from the mobile app, @powerny.

You can edit the customer details using the QuickBooks Online app from the menu. Let me show you how:

1. Go to the Menu (☰) icon and select Customers.             
2. Click the customer's name that you want to edit and tap on Edit (✎) icon. 
3. Update all the necessary information and click on Save once you're done.                                              

Here's more information on how to add, delete, merge, and restore customers in QuickBooks Online: Manage your customer list.

Stay in touch if you need more help in updating your customer's profile. I'm always here to help. Have a wonderful day!