Action Details
Requirements and how-to articles for Twitter's action:

A simple, text only tweet.

You need this to get it done:

Tweet Text
The text to be tweeted (maximum of 280 characters.)
It can consist of links, hashtags (text preceded by '#') and refer to other twitter accounts (twitter username preceded by '@')
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Twitter Help Center - How to Tweet
Twitter's first page of their help section to provides you with the basics about how to tweet, what can be tweeted etc.
Link missing here or found errors? Improve How-Tos