Does any one know if you copy your maskdawn user name from the official maskdawn app to ice cubes.

I'm assuming you're asking about mastodon here. I am unsure if you can do this from within the app you have mentioned in your post, as I do not use the aforementioned application. I am a mona user. I regret that I am unable to offer you aid, and will take this opportunity to offer a sincere and heartfelt apology for this lack of information.