Where can I find documentation for using translationStudio (tS)?
The documentation for tS is at https://ts-info.readthedocs.io/en/latest/index.html.
Direct link to the Desktop (Windows, Mac, Linux) documentation is here: https://ts-info.readthedocs.io/en/latest/desktop.html.
The Android docs here: https://ts-info.readthedocs.io/en/latest/tablet.html.
It probably should be mentioned there is also a PDF in the repo, which I found much better than readthedocs as it has screenshots:
(Compare page 53 of PDF with tS for Desktop: Modifying Program Settings — translationStudio Information 0.1 documentation)