How do I get an appointment scheduled at the Genius Bar?

Start at apple.com/retail. Select your location and then look under the services offered.

Duchess444 Said:

"[...]have bee trying for 45 minutes to just set up an appointment at the Genius Bar[...]"

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Contact Apple Support:

You perform a set one up, maybe by contacting Apple Support via phone. They will send you a prepaid box with labels inside.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through.