Convert old MYSQL code to work with MYSQLI

I have a rather simple task (i think). There's a few lines of code that connects to a database, all which of the functions seems to have been deprecated from php and now give error messages when used. "mysql_fetch_array() expects parameter 1 to be resource, boolean given in..." I'm not a coder so trying to figure out how to convert these few lines of code i rather just leave it to you to do it for me. This is a quick project, i wish for you to start asap and i expect it to be done pretty quickly!