Do you have a specific question about Lightroom?
Which version of Photoshop and Lightroom did you use in the Studio?
Which version are you using now?
There are plenty of training resources online to help you depending on what you're struggling with.
I can't remember. it was 3 years ago. I am just using a trial ..so I knew if I would like it. I can't get anything to work or save..nothing..i have tried the videos ..nothing is working
The basic concept of how Lightroom works has not changed. Images that have been modified need to be exported as copies. What is it that you are trying to do that isn't working?
What you learned in the studio still applies now.
Give us more specific examples of what steps you're taking so we can see where you're struggling.
Or go to lynda.com or Adobe TV and watch some basic How-to videos. You'll soon be up and running.
Do you remember that in Lightroom, you don't "save" images like you do with Photoshop and most other photo software. You just make your changes, and the changes are automatically "saved" in real time, but you can always undo the changes, now or anytime in the future, because it's non-destructive. When you're ready for an image to be used outside of Lightroom, then you Export it, or Publish it via a Collection or whatnot.
nothing is working
Oh, I'll bet that lots of things are working just fine.
Taks a breath, relax, and articulate your problems.