A test charter is a tool to run exploratory tests. With the test charter the stakeholders define the scope and goal of such a test. By writing down this information, the charter remembers the team to concentrate on a particular type of risk while exploring the software.

A good charter provides inspiration on how to run the test without determining on how to conduct it and without prescribing the test results.

This template - and  this is true for all templates - is just a tool to help the stakeholders to write the important things down. You may add the three main aspects - mission, tools, information - of the charter in their own sections or write the information in just one sentence as the short description. Use what ever makes you feel more comfortable. If you want to alter the template to better suite your requirements, feel free to fork the project containing the blueprints!