Your first MAST report
From Wiki
The best way to begin using MAST reports is to try out some of the public reports which have been provided for you as templates.
When you feel ready to try creating a report from scratch, here is a Word document containing a step by step guide to creating and using a straightforward MAST report, similar to the public report entitled Crashes by Date and Severity. This guide gives detailed step by step instructions at every stage, and you may find it a useful way of getting to grips with the interface of MAST Online.