Apps won't move to trash- Macbook Pro
Recently my macbook got too full/slow so I had to start thinking about removing things. I have tried to drag many applications to the trash and just nothing happens and only a couple of apps have a little cross next to them when I hold them down. These are apps like photoshop and the sims that aren't already on the laptop. I'm not sure if I'm missing something obvious but any help would be appreciated!!
MacBook Pro with Retina display