Ya know, this is SO difficult.

I paid for the first month. I imported a STL file. I need to manipulate the model so I can make changes, namely, I need to select a corner and move it freely, to be able to examine it—not go through multiple steps to move it on one axis or another. Isn’t there a way to do THIS??? I can’t even get started, much less try the program.

https://support.shapr3d.com/hc/en-us/requests/new

You need to give us more information to help you. A drawing, a sketch, an image marked up.