How do I post a daylily I am looking for ?

You could try posting a "Wanted" post in the Classified forums: https://garden.org/forums/view...
Or, if you look it up in the database, you may find a link to a vendor or possibly a list of members who might have it available for sale or trade.

Also, the Daylilies forum has a thread at the top of their list for "Wanted to find" daylilies. I'd try there first. Here's the link to that thread:

The thread "Wanted to Find Daylilies Spring 2017" in Daylilies forum