You receive access automatically. What appears to be the problem?
Sometimes you need to reload the template generator a couple of times before it recognises that you are logged in, but after that it should function as expected; alternatively you can login via the template generator then it will take you to the forum, then if you go back to the template generator it should work as expected (I have a fix for this ready to be implemented, but a few technical issues are delaying it’s implementation). The CSS generator for menus should always work fine.