In the Help there is a section on Applying Assembly Constraints with some animated examples. I don't think that is one of them.
Do you want the edge to follow along the curved surface or be fixed in place?
I would want the edge to follow the curve. By being able to constrain the front (as shown) and back edge of the tab to the the curve I could then drag it to where I want it or do an edge to edge offset to position it a set distance from the tip.