How do I change the background of my profile thing? Also how do I make a link for things when I comment? Like I might want to link something to one of writing pieces.
Click the gear in the line of tabs up top. This reveals a new line of tabs. Click "Profile". To the left there should be a list of options. Click "Edit style" at the bottom. Then you can find a link to an image you want and set it as the background.
From checking your profile, it looks like you've figured out the profile things. :)
Linking (just in case you're still not sure how to) is really easy. There's two main ways. The first and easiest one is to just copy-paste the URL of the work you want to link and it will automatically link for you. Like this:
Words are pale shadows of forgotten names. As names have power, words have power. Words can light fires in the minds of men. Words can wring tears from the hardest hearts. — Patrick Rothfuss, The Name of the Wind