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:
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