To search for an input, the simplest to do is to type in keywords in the Search box in the left panel.  You'd then be given different options.  You can try typing in 56 in your case.

The input screen for Form 56 is under Misc. Form > Notice Concerning Fiduciary Relationship (56).  Check the box for Print with tax return, make the relevant input underneath, and the form will be printed with the F.1041.