Question about Rogaine for hairline

[Zeal]

I have a v-shaped hairline and have begun using Rogaine foam to try to get some regrowth. My question is: Do I apply the foam only in the area where hair once (below the current hairline) was or do I rub some of it into the hair/roots of my current hairline?

 

[UK1]

I put it where I want regrowth and also where it's getting thinner and I expect to go bald, ie: the whole frontal area.