Okay so to abandon a quest; go to Quests (above dailies in the side menu), your current awakening quest should be at the top, then tap on Quit. It might ask you if you're sure you wish to quit, tap Yes/Ok.
When you restart it; a page will appear laying out both stages of the awakening. On the left (which is the first stage) there should be a tile that says something like 'choose a stage/place' and when you tap on that, it will give you several places to grind from. From there you just pick which one suits you best, and then you get started