Mark the location of the oar locks just aft of the midline of the boat railing with a marker. Measure the distance of your first marking and duplicate it on the opposite side.
Drill holes in the places you marked with a power drill and drill bit. Most oarlocks are approximately 1/2 inch in diameter, so the drill bit should be about that size.
Insert the base of the oarlocks into the seats you just drilled. Many oarlocks are made to be screwed into place in their seats. In this case, screw them into place with the supplied screws using a power drill and driver bit.
Insert the oars into the oarlocks.
Attach the oar buttons on the oars on the interior side of the oarlocks.