There are a couple ways you can do this, one way is to open your friends list and click on the down (or up can't rmember as I have a skin on my steam so idk if it's the same layout) arrow next to your name and select "Change profile name." The other is to go your profile and select "Edit profile" an...

Yeahhh, he banned me as well about an hour ago.. Doesn't like us shitting on the game for making it a joke. xD

Looks like crap and it makes me sad.. :/ Don't even attempt to have an opinion on the steam AoS Community discussion about the original AoS being better or mentioning that Jagex nixed the modding aspect. Just get banned and have the post deleted for the most part.