Attaching Shipping label Question

Question
When I purchase my shipping label online, I will later print it out, so that it is a piece of paper from a printer. correct?

Then would I attach it to a UPS Express (Pad)Pack by placing packing tape over it?

Sorry, this is probably a stupid question.
I ask them so no one else has to. . . 

I fly to the US after Christmas so just thinking thru details as they pop in my  head. . .

Kathryn

There’s usually a clear plastic window on the packaging to slide the address into. A bit like a luggage tag.

Ah ok.
I appreciate the info as it will stop me from picking up some packing tape on a limited budget!   
Thank you!