Metadata_username value to send to MainMenuActivity.xml

Hello guys, I just want to ask a question because I am customizing the Kobo app on my android device.

I just want to ask how I can get the metada_username value to be displayed in my MainMenuActivity.xml after I scan the QR code.

PS: the QR code is already customized and has a metada_username included. Also in my project settings, it is displaying the metadata_username from the QR in the Form Metadata.

Please somebody help me!! Thank you in advance!

Can someone help me?