Hi Meredith,

work on computer is not grammatically correct, so don't use this.

Work on the computer can be used like this:

- I am working on the computer at the moment (this means you are working now and using your computer to work)

- I work on the computer every day (this means you use your computer to work every day)

- I have a lot of work on the computer (this means that you have a lot of work saved on your computer)

I hope this helps you!