Manually splitting polyline into two parts at specific vertex?

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I defined a brand new shapefile as a polyline type in ArcCat. When I opened ArcMap (10.1) and started an editing session, I had no problems adding vertices. I would now like to manually add a point at the start of the line - but I am having unexpected difficulty.

Edit: I think I may be taking the wrong approch here:

While in editing mode with the shapefile selected, "point - adds point to the edit sketch" is greyed out. If I go to Editor> Construct Points, I get the error: "The map does not contain a point target. Add an editable point layer and / or a point template to the map."

I am confused at this message. Is the polyline not a point target? Under my Create Features window, the shapefile shows up with the "Line" construction tools. Is the polyline not the "template to map"?)

I have looked at online help related to my question - but in my case, I can't can the point tool they mention in step 9.

EDIT: I think I may have misunderstood the purpose of "add point" - I thought this was how to manually "split" a line into two and have the line acquire a row in its attribute table. So to rephrase my question: how do I define a vertex so that it "splits" a line into two segments? (I'm no longer sure what "add points" is meant for)



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