To trade, you have a "trade" button. You click on "start a trade" and then you have a list of all the members who have some creatures to trade. Choose one of them and propose an equitable trade
In the member list, the names writed in green are the members who have pets you wich and who himself search a creature that you have. The names in blue are the members who search creatures that you have but who don't have creature that you want. The names in rose is the contrary, that's the members who have creature on your wich list but who don't search creature that you can propose.
(Am I clear ?
)
For the pet's growing, it's generally takes one week to an eggs to be a baby, and 3-4 weeks to a baby to be an adult
EDIT : Ah, echo-77, t'as été plus rapide