Accidently hit wrong button and bypassed quest

was attempting to enter the shadowlands chain quests [Shadowlands: A Chilling Summons] an I accidently hit the wrong button that sent me to Oribis. This is my first time going through this so I want to understand the layout of the ground and so forth. Is there any way you can back me up to the point where I am asked for help. My character is Samoine level 50 Blood elf in Orgrimmar. Thank you!

Rambo