My name is Draginfund.
You spelled your name wrong, but I got you.
Which app sign this message help me I'm list here
The name of the app so mycelium Wallet.
It's obvious you didn't go through this thread
https://bitcointalk.org/index.php?topic=990345.0isn't about sign and verify, you gain more knowledge about why sign and cons and pros.
I did but I'm on if it can be done on a mobile bitcoin wallet app because I don't have a PC