A wealth of documentation can be found on the Google Code homepage: https://github.com/robbiehanson/CocoaAsyncSocket
If you are new to networking, it is recommended you start by reading the Intro page:
If you are a seasoned networking professional, with 10+ years of experience writing low-level socket code,
and detailed knowledge of the underlying BSD networking stack, then you can skip the CommonPitfalls page.
Otherwise, it should be considered mandatory reading:
Your first goto for reference should ALWAYS be the header files. They are extremely well documented. Please read them.
Did I mention you should read the headers? They're docemented very nicely, in plain english.
If you have any questions you are welcome to post to the CocoaAsyncSocket mailing list:
The list is archived, and available for browsing online.
You may be able to instantly find the answer you're looking for with a quick search.