How to I breed two pets when I own both? I figured out how to run to the Breeding Offers list under the "trading" tab to breed with someone else's pet, but I can't figure out how to breed a pair of my own... Which is weird, cause I somehow managed to do it twice by accident, but now that I want to do it on purpose I'm totally lost. *sigh*

You have to start from the females page.

Make the female you want to breed your active pet. Then click "breed" and your males will be in the second half of the page. You can click on the male you want, double check it's the right female. And breed. :)

Hope that helps!