Laying Out UVs
 

My professor showed us how to lay out the UVs and move them so that they are perfectly rectangular so a texture will appear properly on my model. He showed us on version 7 though and I'm using 8.5 on my own computer. I've tried cutting UVs and selecting Unfold from the menu, but I can't actually select individual UVs and move them to make them flat. What am I doing wrong?

select your object, go into the UV editor and then right click on the mesh. Selecting UVs should be one of the options.