Hey kudos for giving it a go and no one knows how to do it until they're shown or told how to do it , for some of us this is simple but if you've never used a tester before not so simple .
I recently wired up some mirrors and the metal plate I put the alligator clip on was not earthed , I spent half an hour and plenty swear words before I dragged out the multi meter and checked that the earth was no good .