This is the way I give cats or kittens liquid meds. I am giving some now, actually.
I sit on the floor, legs out in a "V." I take the cat, and put the cat between my legs, and close as can be, face facing away. I measure out the medicine, and hold it in my hand. Using my free hand, I grab under the cat's neck, gently, and keep one finger on top of the head, and hold the head still. I put the syringe/dropper up to the mouth, and as soon as the mouth opens, I drop it in, but still hold their head until they take the medicine. Sometimes, the kittens will be unreasonable, and I must force their mouths open. To do this, I take my two side fingers, and put pressure at the jaw, and drop the medicine in when I get the mouth open.
Hope that helps!