URL Issue

Hey everyone! I’ve gotten decent with wordpress though im having some issues. I bought a web domain and have it pointing to my servers. Unfortunately it doesnt show the domain name that I bought only my server name.

I went into the MySQL database and I was trying to edit the domain names used, as soon as I did that I come up with an error right away saying its having database issues.

Do I need to do a reinstallation of WP and have it reinstalled with the domain that bought?

Thanks to anyone who can help me on this!