topic moved to Web Servers as for your question: to "install" php scripts on your server, you have to upload them to a public directory on your server. This directory is often called "public_html" or "public_http". What do you mean with configuring your database? do you host your server yourself? or is it hosted by a company? if hosted by a company, they configure your database so you can work with it.
part of the conversation seems to be missing, but i'm guessing that when they say configuring your database when you install a php script, they mean telling the script the host, user, and password for your database.