ASUS usually emails you a prepaid shipping label (if under warranty). Do not just slap the label on the laptop box.
Before initiating an RMA, go through this checklist. Skipping these steps can result in your RMA being delayed or denied (and you being charged a service fee). asus rma check
The status bar can be vague. Here is what the terms actually mean: ASUS usually emails you a prepaid shipping label