when i try to report new project ерашкые line is " *Category ". It has drop-down menu but has only " select " option . What is this, which one category it means?
Categories are specific per project. You have to go to the Manage page and then the Manage Projects page. Click on a project to manage and you can add categories to it. The category is just for classification purposes to use in filtering and organization so you can group issues about a similar subject (e.g. Security) together.
-Joe
Mantis Version: 1.1.2
Disclaimer: Answers are based on the Mantis version above and may be inaccurate for newer/older versions which may have different configuration options and/or functionality.