Print Screen button?
Is there a print screen button?
Tap the "fn" key and the "tab" key at the same time to print screen. Other keybindings can be found here: http://www.logitech.com/en-us/manuals/k380-setup-guide
If that link doesn't work just google logitech k380 setup. I printed the key binding photos and pinned them to my desk till I learn them all. Might help you too! :)