Unfortunately I do not have any more seeds left, and for me, the trading works like this:

Since I am trading a seed for eggs, once someone has the amount of eggs in their inventory, you would click the eggs, click on the small mail icon, and put in the user you are trading with. And for me who is trading a seed, I go to the garden and click the seed, click trade and put in the trader's name and click send.

Hopefully you'll be able to find someone else to trade with!

Thanks so much! have fun with the rest of the event!