Yes, you should see a print label button in your orders--if you have not marked shipped. This help article has a screen shot of what you should see in your open orders:
http://www.etsy.com/help/article/3156If you aren't seeing it, try a different browser if you have one. You can try all the other "usual things" clear browser cache, reboot computer.
If you still don't see it, I would say post in bugs and see if they can help there. They will probably want a screen shot of the order page with no print label button. Instructions how to take a screen shot here:
http://take-a-screenshot.org/You don't have to use an old order to print postage from paypal you can go here and buy paypal postage for a single order:
https://paypal.com/shipnowHope you can get it sorted out soon.