Regardless of the type of game you want to run on Boosteroid, you should have a personal gaming account in a corresponding digital distribution platform (e.g. Steam, Epic, Wargaming).
For example, if you want to launch Counter-Strike: Global Offensive, you need to have a Steam account to log in.
Below you'll find the links to articles outlining the procedure to create an account for the following DDPs.
Note that some games have their own exclusive launcher. For example, when you launch Crossout or War Thunder, you need to log in to their own respective launchers.