There are three Apple Stores in the UAE.
Store number 1 is at Yas Mall (مول ياس) in Abu Dhabi (أَبُو ظَبْيٍ). It is the capital and the second-most populous city of the UAE. Abu Dhabi’s Emirate is the wealthiest in the UAE in terms of GDP and income per capita.
Yas Mall is located on Yas Island, which houses Yas Marina Circuit for the Formula One.
You can say you’re looking for متجر آبل (read as matjar abal), which means Apple Store.
Store number 2 is at Dubai Mall (دبي مول) in Dubai (دبي). It is the most populous city in the UAE and the capital of the Emirate of Dubai. Burj Khalifa and Burj Al Arab are in this city. Dubai Mall is the second largest mall in the world by land area.
Store number 3 is at Mall of the Emirates (مول الإمارات) in Dubai (دبي), as well.