Visual Basic Noobie READ PLEASE

So I am trying to make an injector I will try to be specific in describing my problem ...
So I don't know how it workks ,but I am watching a video tutorial and everything was working until now I am stuck where I add the timer code , I am to paste the timer code under the browse code right , but there is no private sub thing for me to put it in , and the thing after says end class , so I don't want to mess anything up , so if some one could jump in and help me out it would be appreciated.