Before the Beta Swap got underway, there was a lot of esoteric discussion about what MIGHT be done in future swaps. I contributed more than my share of Rube Goldberg digressions.
But people who were just scanning the threads wondered what the HECK all the rocket science and jibber-jabber meant for people who only wanted to trade a few seeds!
The answer was usually "all that is irrelevant. Just find this screen ... and click this button".
Off hand, I don't recall any one post or thread that explained what to actually DO from Step One to receiving your seeds back from the host. If you find the right screens, it's fairly self explanatory at each step.
Except that the easiest way to add plants to your swap list is to FIRST add them from the database into your "HAVE" Plant list. Then add them to your overall swap list. Then add them from there to one swap list. Then click the check mark to turn it green.