How do I get Ultimate Facebook to post on my clients FB page?

I just launch my clients new website this afternoon. I put in the new FB credentials etc and made the first post. The post showed up on my FB page not my clients. What in the world did I miss?

I created the app as shown in Kimberli's tutorial. I registered as a developer, and built the app logged in as myself. Filled in the app with their site yada yada yada. It works, but the posts are going to my FB.

How about a pointer so I can get this working please.

thanks