I navigated to course-administration > course-configuration > permissions
(webwork2/admin/instructor/config/ > click permissions)
but Scoring Tools access is not listed there.
How can I do that?
I could dig for a server file that would do it but the easiest way is to change your TA to "Instructor" (that's what I do typically)
In the defaults.config file there are permissions like
%permissionLevels = (
...
score_sets => "professor",
...
modify_scoring_files => "professor",
...
);
I haven't tried, but maybe it works if you place modified version of it in your local course config file.