Post a pic of the blade so we can advise on what type of stroke might be best - if its a straightforward blade you should be able to touch it up without too much trouble. I always use a heel-leading 45 degree angle x stroke for straight edges. For smiles I like to use a rolling stroke alternating with standard 45 degree x strokes.

Also decide whether you're going to be a taper or a nontaper. If you decide to use tape (which is how I learned without completely destroying my razors) you may need to start from the ground up. Since you're just going for a touch up and assuming that the razor was initially honed without tape, I would hold off at this point and go naked.

John