I think I set something wrong with my URL structure but don't know how or what.

If you go to my website www.thehateblog.net it "redirects" or just removes the "www" and I think I've read that having the www is better for SEO.

Anyone know how I can add it back?

thanks for the help.

doesn't matter whether you use www or the non-www version, just as long as you don't use both.

BTW the redirect is using a 302 temporary redirect. Tt should be a 301 Permanent Redirect