Hi there, hope this helps:
Thankfully, in Florida, you can actually schedule DMV appointments online easily through the Florida Highway Safety and Motor Vehicles website. It's super easy, and all you need to do is follow the prompts on the screen to go through the entire process (if you're still not sure, let me know, and I'll try to help!).
Also, you mentioned about wanting to re-schedule? If you need to, all you have to do is log back in to that appointment system I mentioned earlier, and from there, you can cancel your current appointment. From there, you could also choose a new date and time that works for you!
Just remember to schedule your appointments way in advance, depending on what you need to do
