After you post your diary, click on it; click on "post a comment"; in the subject line, write "Tip Jar"; post it.

I have come to enjoy your diaries very much.  Please give me a chance to "reward you".

is your tip jar; if the subject line says "Tip Jar" it makes it clear, but either way, that's it.
You might want to put a more descriptive headline on your great diary!
I'm a writer too, among other things. And I've been thinking about focusing more on that, and this diary inspires me; thanks!

will get people started commenting, too.  It's considered bad manners to post before the tip jar, so people wait and the diary can scroll down with 0 comments.  If I see a diary with no comments, chances are I won't take the time to read it.  Don't feel awkward asking for tips.  We won't go broke handing out mojo.

of saying, "Thank you for this diary" without posting a comment. ;-)

get to the Rec List and stay there a short time.

But the more your comments are recommended, the more "mojo" you collect personally.

Eventually you can punish us with troll ratings for disrupting your diaries.

make your first comment pithy and interesting.

For example, jotter (our resident stat person who keeps us up-to-date on the most current  stats and most recommended diaries, etc...) posted his "tip jar" in alphabetical order one time... "Acclaim alcove" ...then started over again.

It was fun... jotter and the tip monster

Lots of great "tip jars" here.  You're amongst a witty and snarky bunch of the best peps in the world.