How do you accept bitcoin donations on a steam group? I am running a game giveaway group on Steam.
What is the best way to accept donations?

P.S I am completely and utterly new to Bitcoin.
The easiest way would be to create a wallet and to dedicate a single address from it to receiving donations. For the convenience of the donaters you could present it both as a QR-code and a bitcoin URI. As with Jonas' answer you wouldn't want other people to be able to change the information on the page where you provide the donation address, as someone might replace the donation address with their own.

For improved privacy, you could replace the address with a new one every once in a while.

For a more advanced, private setup check out Jonas' answer.