Sigils For Dummies, a little confused Options

I'm not sure it I am in the right place but, I have been studying traditional witchcraft for about a year and a half now. Its working out fine but I thought--is this really the path I should be on? So I am looking around now and came across, Intro to High Magic, Frater AD.
I have been reading on simple word sigils and I'm ok with making it and charging it. Its the forgetting part that's a problem. Do I need to forget the sigil itself or the reason I made it in the first place. If the later that's too bad since I can't forget something I think about constantly. Maybe I just don't get it, can someone explain?

I have to say this went just perfectly. I still was not sure I was doing it right but exactly seven days later I lost two pounds as willed! I'm so happy this worked out I can't wait to do another.