“How do you shower after ear surgery?”

Depends on what type of dressing your surgeon put on your ear after surgery. For my patients, I advise them to shower the next day as long as they don't wet the ear dressing. I usually remove the dressing after 5-7 days.
Didn't your surgeon explain all of this to you? Ask him or her for their specific way they do things!

You have to wait until your first appointment and have further instructions from your doctor