Guild Wars 2

I want to move a new skill I recieved in my skills into my action bar, but when I click on it to drag it into the action bar empty slot nothing happens.So how do I add this new skill?

Little ^ above the empty slot. Click that, a menu of abilities will appear. Ones you can use will be coloured, ones that you have not yet bought will be greyed out. Just click on the colour ones.