I have  a question about how to introduce hydrogen bonds between ligands and target molecule in pymol that runs on linux ubuntu 12.04 operative system.
I have searched and tried to type following command:
set h_bond_cutoff_center, 3.6
set h_bond_cutoff_edge, 3.2
 and I tried to choose [A]-> [find]-> polar contacts-> different options, but it also don't helped at all.
Do any of you have a suggestion to what might have been gone wrong?

Many big thanks!