I can't pair my ue2 mega boom with my new I pad pro

not sure what a megaboom is but usually when one connects a Bluetooth device with a device it has not been connected to befor the user needs to put the Bluetooth device into pairing / discovery mode how you go about doing so should be in the manual of your megaboom

Hi. Also, if it's paired with another device, like a phone, you need to turn off Bluetooth on it first.