For the weekly draw, the bot wants me to sign a message confirming that I own an address. But when I click on the request to sign message, it signs it with a different address (I have bytes in 2 different addresses). How can I sign the message with my other address?
What address is that? A change address or just another the wallets in the app? Just select the wallet you want to add from the burger menu and then select "Insert my address" from the chat "..." button. It is easiest to do that with single-wallet address because on multi-address wallets, you need to add a new address every time you spend from that wallet because change is sent to your new address. So, if you use multi-wallet address, it makes sense to send all to your current address on "Receive" screen.