First be sure to sign in through your twitch account, if your already signed in on the browser the process is a few clicks.

Next sign up for a CRUX pass. This is where you fill in your Steam ID, Warframe ID, and pick a team. We ask for your autograph and your signed up. If you don't play Warframe and don't have a Warframe ID you will not have access to the Warframe Giveaways. You require a Steam ID for all non Warframe Giveaways. This is just to expedite the process for fulfilling giveaways.

Note Steam has delays from accepting a friend request before you can receive the gift, thus accepting a friend request from an admin is paramount to expediting the process.