You're welcome and de nada!

Hello there! Welcome to Steamgifts.

What you see on the main page is determined by sheer randomness alone. However, there is such a thing called "Contributor level" in which one can create giveaways for people who meet such a giveaway level.

But yes, you just click the big green Enter button, and await until the giveaway ends as indicated next to the entry button. If you scroll down a tiny bit and look to the left, you'll see the entries count. This will help you know what the probability of you winning at the time of viewing.

Please please, read the FAQ: https://www.steamgifts.com/about/faq

Thank you and have a nice day!