So for this particular example I had used samurai wallet which is actually now seized and not usable because the creators were arrested by the feds for money laundering. However, when I was attempting to make my first one I just used a new address of mine that I hadn't used for anything yet.
If you can't use samurai wallet for any reason, you can import your wallet into other softwares and sign a message there.
I recommend you to use electrum.
Download electrum only from
its official website.
I have a screenshot of it but I can't post pictures
Upload your image to
talkimg and share the liunk here.