If you installed RoboDK after installing FreeCAD, you should have the RoboDK plugin for FreeCAD already installed.
The RoboDK commands are available by selecting RoboDK from the workbench drop-down list:
If you prefer to have a custom RoboDK toolbar you can create it separately by following these steps:
1.Start FreeCAD.
2.Set up and add the RoboDK custom toolbar:
a.Select Tools➔Customize…➔Toolbars.
b.Select Category➔RoboDK.
c.Create a new custom toolbar in Global category.
d.Add required RoboDK commands from the list on the left side using ➔ button.
Once this is done, FreeCAD will display a custom RoboDK toolbar as shown in the following image.