You will need to connect your Steam account to your GLL profile in order to participate in some GLL tournaments.
If you have signed up to GLL through Steam, you can skip this step.
To connect your Steam account to your GLL account, open your Profile which you can find on the left side menu. If the game you have selected requires a Steam connection, you will find the option to add it in the Settings tab of your profile page.
Click the Steam button and you will log in and confirm your Steam account and it will be instantly connected. If you do not already have a Steam account, you will be able to create one.
Please make sure to submit a request if you are unable to connect your Steam account.