If you want to do Upper Return to Karazhan Heroic you must use the looking for dungeon tool.
If you decide to enter the Karazhan Side Entrance manually you will be in the full Mythic Return to Karazhan Dungeon (Lower & Upper together).
You can find the Return to Karazhan dungeon entrance within Deadwind Pass, Eastern Kingdoms.
The coordinates are (46.8, 70.1)
1. The Curator
2. Shade of Medivh
/i Interrupt Frostbite & Piercing Missiles. Keep moving/jump when ice (Ceaseless Winter) is on floor. Dont move when Flamewreath circle is cast on you & dont overlap another players. Focus kill adds. Move red circle (Inferno Bolt) away from others.
3. Mana Devourer
4. Viz’aduum the Watcher
/i Player with Chaotic Shadows move away, avoid the purple orbs. Dodge green eye beam (Disintegrate). Avoid green swirls on floor. Use portal 1. Run forward & take cover on sides to dodge green eye beam. Use portal 2. Tank take adds to boss, pop Lust.