How can I run the GUI for the sliceomatic add on?

Hey guys, I'm very new to Matlab and dont really understand add-ons, I downloaded the sliceomatic add-on, and it says in the comments at the top that there is a gui, but I dont see anything like a gui when I try to run the function. I have data of the type v = f(x,y,z) and a mesh grid xi,yi,zi, so I am trying to use sliceomatic to view the data like so: sliceomatic(v,xi,yi,zi)

Thanks