Confused about return shipping - waybill or just account information

I am heading to my biometrics appointment then the UPS store this morning. Can someone please help me clear the fog about return shipping from Sheffield?

When I send my package today, do I include a UPS package return envelope and a prepaid return waybill?

I have seen that people include their account information. How do I do this? I opened a UPS shipping account online last week. Will UKVI log in to my account and add the return shipping?

I don't get how this part works. Sorry for being so dense

I hope someone can help. I have 1.5 hours before I leave for the appointment. I know I should have asked this question before today.

I printed out the labels for shipping and return from my home printer. Hopefully, the people at the UPS store can help me the rest of the way.

I don't know exactly what UPS does but I just printed out online labels and included the return one with an envelope in the package I sent to Sheffield.  They then made their own waybill to send everything back to me but making that return label at home 1) allowed for a return and 2) gave them my courier number.  Hopefully UPS is similar.  I am sure the people at the store will be able to help you.

I didn't include a return label. Just a sheet of paper with my account number on it. My visa arrived via fedex this morning so that seemed to be all they needed.

Apparently all they need is the international account courier number. I used UPS. I did this on the phone with someone (from UPS) and they walked me through it. Originally I sent a FEDex return envelope, but they no longer except that so use UPS or DHL. Sheffield emailed me directly only asking for the account number. No labels needed to be created. I will let anyone know if there is anything new/other updates, but for UPS it seems they just need the account number. This is not your username/login. It will be a specific number. Hope that helps.

I did both the return label/envelope and included my account number. Was very confused but it's my own fault for not clearing things up sooner. 

Hi!

I created an account with UPS, made a return label and included it with the rest of my application. It's currently in transit back to me and I didn't receive any complaints from UKBA. So, I think you'll be fine with the label!

I included a return shipping label with an envelope as well as my account number for UPS and still got an email requesting an international courier account number when my package was received.  I was really confused as I had included my account number but emailed the UPS info as well as my FEDEX account number back to them.  They never responded that they got the information - but it has been sent back today with the UPS label I included so it seemed to work out *hopefully* haha.  Best of luck!