Hide User Meta in Register Form

Hi there!

After i created a few user meta with the plugin “user meta manager”, the newly created field appear in the “edit profil” page, which is great. BUT, they also appear at the register form, between the fields for email and password. I dont want a new user to fill those infomations at the registration, it should only be visible after, when they edit their profile.
And I have absolutely no clue where to hide those fields (I tried to do so in register-form.php, but this is obviously not the correct way).

Does anybody have/had the same problem, ans maybe a solution? Probably its pretty easy and Im just to dumb to find out…

Regards

http://wordpress.org/plugins/theme-my-login/