Calendar in Home Page

Hi All, I am a user who is developing an xwiki for my research team. I am faced with two tasks that I am baffled by and I did research on the site and still can not find it. I need to put rights on the topmenuheader (meaning only administrator can see it) and I need to embed the calendar on the Main.Home (or dashboard) page. Please help with this problem. Thanks in advance, Tim