Here is what I am talking about:
When I am tanking for my guild, I always have to ask someone to do it, because it does not work for me from the slide-in from the standard raid interface. Guild told me it works via the slide in, but it does not work for me. I am always Raid Leader or Assistant so I should have the rights to do that.
How exactly do I put those signs down? It would be really handy for my future tanking endeavours.