How do I connect my godaddy domain to a site hosted elsewhere?

I bought a godaddy domain a few months ago and linked it to my blogger site. I have no idea how I did it, but somehow I figured it out.

Now I have a free website being hosted at my university, and I want to have my domain linked to THAT site, not the blogger site.

I cannot figure out how to change the site that is connected to my godaddy domain, and even if I could change it, I don’t know if I can use the domain name on my site hosted at my school. HELP!!!