Need a Apple store appointment

You can make an appointment:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple
• Using the Apple Store app, available on AppStore
• Contacting an Apple Store among this list:--> Apple – Location Selector

Regards

Giulio

For a Service Appointment, see here: link-> Get your iPhone, iPad, or iPod touch ready for service - Apple Support

However, if its just disabled due to forgotten passcode or other software based issue, you don't need to take it in to Apple, you can fix it yourself. See here: link-> If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support