Transmission not shifting properly

Hi, my name is Dan.

If the transmission is not engaging at all, I would check the transmission fluid on the stick with the engine running first. If the fluid is low, the transmission cannot function. Have you checked for any diagnostic trouble codes yet?
Is there any noises when trying to move? Any whining?

Look over these quick check guides to see if anything pops up:

https://www.2carpros.com/articles/automatic-transmission-problems

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing