Tell us what you are trying to do?
I use Feedburner to send out new posts to email subscribers, but it's not including my new posts that I created with Post Types in the feed. (I'm willing to use something other than Feedburner if it works.)
Is there any documentation that you are following?
I read some about archiving the new Post Types, but it looks like to me that all my new types have an automatic archive.
If you have a custom post type, the default settings (at Toolset > Post Types, under Options when editing the post type) will have the option for Feeds checked, and so the custom posts should be available in the feed.
But which feed?
A specific feed will be created by WordPress for that post type, e.g. for my CPT "thing" the feed looks like
hidden link
WordPress only includes blog posts in the main site RSS Feed. If you want to include custom posts in the feed, you'll need to add a little code to update which types are included.