PowerApps: Text Input Inserting Into Edit Form on Other Page

Hello,

My PowerApp is used by managers to approve or deny discounts. The source of the data is an excel file that is connected to a PowerBI Report. The Manager clicks on a row in the table on PowerBI and the discount details come up on the PowerApp and they make a decision and leave a comment. They also are required to enter their name into the form, but I want to eliminate that step. 

I am trying to create almost a login screen where the manager enters their name once. The text they input into this screen then transfers into the "Approver" section of the Edit Form on the next screen (Screenshots below). I have not found a way to successfully do this. I was not sure if I should use a text input that saves as a variable then setting the edit form on the details page equal to that variable? Any help is appreciated, thank you!