From Desktop (Username)
Click on the Settings Icon from the top right of the Yac app
Click Edit Profile at the top of the screen
From there, click on your username to begin editing
When you're done editing, press Enter on your keyboard
Click Save Changes.
From Mobile (Name or Username)
From the messages list view tap the settings icon in the top left corner.
Tap the first option in the menu - “Edit Profile” is what you’re looking for.
See the second option down? The line item titled username. Yep, tap your username.
Give yourself a fancy new username. Maybe coolkid123? Or iloveyac2020? I’ll let you decide.
After typing in your new username, just tap save changes at the bottom of the screen!