Hide admin menu options


In the wordpress admin area, I've seen the new "eNewsletter" menu option, with different submenus. I want to hide some of this submenus.

I have installed "Adminimize" for hiding purposes, but it doesn't work with e-Newsletter. I cannot hide menus. Can you tell me a way to hide this menu options?

A second question. Any subscriber will see in his wordpress admin area the eNewsletter menu, and it shows the different groups created. I have created a "testing" group, and with this menu anybody can subscribe to this testing group. Is there a way to disable this? A way to hide e-newsletter for users or a way to hide some groups, or a way to restrict wich groups a user can subscribe to?

Thanks in advance.