You can't do a anything...
I purchased Portal 2 but accidently assigned the steam account to my sister's PSN account rather then mine. How, if possible, could I re-assign my steam account to my PSN account?
Go to http://store.steampowered.com/ and click on the "Get Steam now" button. Download that file and run it, and it will install Steam. Now, just run Steam, and it'll ask you to make an account. Enter your information, and follow any other steps it prompts you to take.
To create a Steam account you need to go the the Steam Powered website and go to Create A New Account. There will be a form to fill out and you'll get an email with a verification link that you need to click.
Yes, but it's free.
no you cant steam friends in an acount.
Yes, you need a Steam account to purchase and play Garry's Mod (GMod). The game is available exclusively on the Steam platform, where you can buy, download, and manage it. Additionally, having a Steam account allows you to access community features, mods, and multiplayer gameplay.
It is not possible to delete a Steam account. However, you may be able to contact Valve (the company behind Steam) and see what they can do. Contact link in the related links below.
SEcret
Yes but games are not
yes
The lower the digit count the older the account is.
no