How to trade mortys?

1. IS trade only done by donations?
2. IF it is, what if the morty that someone wants to get has not been seen by them
3. How does trade work

[burp] yo ding dongs how do I trade my dumbass [burp] mortys

It's not a trade per se; you add players as Friends and request a donation. The trade happens when the newly-friended player donates to you the Morty you're looking for and in turn you donate to him the Morty they want. It's based on an honor system, as there's noone to regulate the trade.