I have a book that I haven't posted yet. 

Someone on my Buddy List has said they'd like to have it but they were waiting for a credit to come through.

When I checked the wish list there is a member waiting.  I don't know if it's my buddy or not.  

Is there a way to post the book and get it to my buddy?

I'm willing to just send it if it's more of a problem to try to get it to this buddy.

I tried to find the answer in Help and I guess I didn't know how to ask the question.  LOL

Thanks for any advice. 

go to your buddy's wish list and post it directly to them because if you don't it will go into the FIFO system

and make sure you do it from their WL and not the description page.  In fact, when you post it to their WL it'll say you are posting it to X's WL.

If you're trying to send it to them without trading a credit: you need to get their address, post a "dummy" book (a non-WL book) to your shelf, go to your book shelf, click on the dummy book and "mail it to a friend".  If you post it directly to their WL and they don't have any credits and don't get credits in time, it will time out on them and remove them from the WL, it'll then offer it to the next person in the WL line.  If they decline because they don't have a credit, it'll remove the book from their WL.  So decide how you're going to do it first.