How to be a succesful poster on an anonymous board:

Forget everything you learned posting on a regular forum/board
This is something you MUST do. Anonymous boards are NOT like the rest
of the internet. You must come onto an anonymous board with an open
mind and a willingness to spend time reading posts BEFORE posting
yourself. There is an expectation that you will conform to and learn
the board's culture. A common example is emoticons; many users are
used to making emoticons such as ^_^ or =) but these are generally
frowned upon and are usually seen as a sign of immaturity. You can
learn all of this and more by reading the air of the board. Also
remember ANYTHING can be posted thus chances are you will be offended
in some way. After visiting anonymous boards for a while you will
begin to be less offended and see why it is silly to be offended by
anything as you probably have thoughts you don't say aloud in person
that are also offending to others.

Read the air / lurk
Reading the air or "lurking" is the most important part of becoming a
successful poster. Each and every board has it's own unique culture
(generally rooted at 2channel one way or another). It is your job to
learn it BEFORE making any posts. This process may seem daunting as
boards do not have a set of defined parameters for posting. The only
way to learn what sort of posts will be enjoyed is to spend time
reading other posts. You will slowly learn all of the injokes, common
posting style and sense of humor of the board as you read more and
more posts. Do not make a post asking about the meaning behind an
injoke or other questions about the board unless you absolutely have
to as most users will be annoyed by this and simply tell you to lurk
more. In addition to this, DO NOT make an introductory post or
anything of the sort you should simply become a fellow poster
overtime. Lurking can sometimes take only a week and other times take
a few months. You'll know you're ready when you're understanding posts
and finding the humor in them. Not all boards revolve around humor but
there is always lurking to done just to make sure you aren't posting
in a style that the others find annoying.

Add to the board with your posts
After you understand the board and how to post let your creativity run
wild! Make witty posts, insightful posts, and any other enjoyable
posts you want to make! But, before you post ask yourself "Will other
users enjoy my post?" if the answer is no you shouldn't post it. Also
do not make posts just to make yourself look good. This is an
ANONYMOUS board the point is to not be identifiable you can tell us a
story about your girlfriend that's INTERESTING or HUMOROUS but don't
just make a post saying Hi I have a girlfriend and we have sex all the
time.

Tripcodes are not for being identified within a board
Tripcodes are a function on almost all anonymous boards in which you
add a #passwordofsomesort to create a string of characters that
appears in the name field to identify yourself. The purpose of this
function is to identify a poster within a thread IF NECESSARY. These
are often misused and allow posters to use the same name on multiple
threads and be identified on the board. This is NOT the purpose of a
tripcode and effectively ruins the purpose of an anonymous board, to
be anonymous!

Have fun!
Most importantly, have fun and ENJOY your board. I think everyone will
find that once you are a part of an anonymous board it will be very
difficult to go back to the regular internet as there is not a
community quite like this anywhere else. You won't regret it!