VirtualBox on Bootcamp, where is the Host key?

I installed VB on top of Windows, in Boot Camp. VirtualBox has the concept of a Host key, which varies from one OS to another. It could i.e. be the right ^ Control key. In this context they say to i.e. go Fullscreen your press Host F. The Host Key should be shown in the Task Bar of the VM, here it shows right ^ Control. However there is no right ^ Control on a Mac keyboard. I installed VirtualBox in Bootcamp. So, where is the Host key? Already tried ⌘ Command F but it doesn't seem to work.