There should be a symbolic link
grading available both in the root directory of your repository, as well as in each subdirectory. You should be able to run the following command anywhere:
If you run it without parameters, it will give brief usage instructions. Try, for example, the following commands:
./grading info mf1 ./grading overview all ./grading show all
In particular, the command
./grading info is important as it will explain precisely how each task is graded.
The grading tool does everything locally, in your local working copy of your personal Git repository. Hence it is always safe to use — you can just run it and see what happens. But this also means that just running it is not enough: you will also need to commit and push everything that you want to submit to your personal Git repository on GitHub.