It is much easier to show than to explain. I would ask the sensei for a few minutes after class.
Ikkyo takes a really long time to understand, and therefore to do correctly. Almost anybody can do an ikkyo from day 1....Almost nobody gets it right on day 1. There is so much to understanding "the center line", weight underside, locking the wrist, etc...
I won't even try to tell you on-line. Ask your sensei.
Good luck. Your aikido & nikkyo WILL get better.