If you click on your name, you can see the posts you made too.
It should have come up for you on your home page though as I made a reply to it yesterday. (are you clicking the ATP logo to get to your home page?) Also, if you click on the Forums tab, you can see all that ATP offers, including the Plant ID forum. If there are any forums you want to watch, you can select 'watch this forum' and it will always show up on your home page.