I figured out that if I double click on CalculiXccxTools in the tree view, I get a Mechanical Analysis dialog where I can set the working directory, then write the .inp file, then edit it, then run CalculiX. When I add the lines in the example from UR_, the reaction loads are included in the .dat file. Previously, I was using the "Runs the calculations for the selected solver" button.
For some reason, setting the working directory in edit -> preferences -> FEM didn't seem to work. When I open the report view as bernd suggested, I see "FEM preferences working dir is not set, the solver working directory is used."
Anyway, it's working now. Thanks for the help!