Menu options missing

Hello, I am very new to Axapta; trying to learn it on my own. I installed Axapta 3.0, service pack 3 and imported the sample data (NAD company). When I try to follow the manuals and do the same operations as they refer to, I noticed that some menu options are missing (for example, I can create a user menu, add tabs to it and items, but I can not delete the items I add; the manual has a picture with more options than appear on my screen). Am I missing something or are there restrictions in the demo company? Thank you, Serguei