Please read through our responses.
We said to apply a presure use the SF command not F (force application)! I have said this 2 times at least : SF,ALL,PRES,10E3 ! use this not F,ALL,….
ALso nsel all is missing a comma just use allsel,all
Use FILE,,rst ! result file, (not sure what rfrq is no such file), and make sure to pick a node that is free so with no BC restrain (U=0), e.g., node nr 287:
So use this instead of your /post26 part (see nsol there is no comp = UZ and all commands in help manual for more info).
nsol, 2, 287, U, Z
/AXLAB, x, freq
/AXLAB, y, disp
If you are not able to open the links, refer to this forum discussion: How to access the ANSYS Online Help
Hope that helps
All the best