The commands of Freedoms are the following:
Del
It deletes all the freedom's conditions of the selected nodes.
Mark
It activates a dialogue box where you can assign the fixed or free d.o.f. to the selected nodes.
You can restrain:
DX: displacement along X direction;
DY: displacement along Y direction;
P: fluid's pressure.
Info
It activates a pointer with a question mark: moving it on the screen and selecting a node, it appears a box with all the information about the freedoms of the selected nodes.