You don't apply them. You contact the site owner (another gaming website) and introduce yourself in an email. Offer to write (or share) something with them. If they accept - write the post. Once you've done this, put the link to your site at the bottom of the content that you create for that person.
Note: Occasionally, people may restrict the type of link you can put in.
Here's an example: dareos owns his
gaming blog where he talks about (idk, but at a guess) Final Fantasy.
"gaming blog" is where you place the link.
This is how you place the link: <a href="YOUR LINK HERE">gaming blog</a>
THE ABOVE EXAMPLE IS AN EXAMPLE OF WHAT A
BACKLINK LOOKS LIKE - PLEASE FOR THE LOVE OF GOD READ THIS.
However, not all sites allow you to post links like that.
No. But you do need to learn patience. Also, take the time to read what other people have said to you - I can tell from the amount of threads that you've created recently, that your eager to get going (which is a good thing). That being said, you're rushing too much and I get the impression that you're only skim reading valuable advice.
Good luck