Go to the Shimano website, they have manuals for all their equipment in pdf format. All the FD work the same way so use a different one if you cannot find your specific model.
As a rule of thumb you want the FD cable to be fully relaxed before touching the FD, it means that the chain should be on the small chainring. Position the FD parallel to the chainring, its height should allow about a 1 to 2 mm clearance when the FD moves over the large chainring. Adjust the inner limit screw on the FD so that the chain doesn't fall between the small ring and the BB. Rotate the knob at the shifter clockwise until stuck against the shifter, release the cable bolt on the FD and pull the cable tight before retightening the bolt. Then play with the adjustment knob and the FD limit screws to fine tune.
The FD cable seems rusty. I would change it.