Get a pump sprayer at the local hardware store & spot spray. You don't have to blanket the whole lawn

Ok do I use 24d or something that will kill everything?

Depends on what type of weed it is, but certainly don't use roundup. Weed be gone with Crabgrass control is pretty gentle, I might start with that. If that doesn't work, step up to a 2,4D or sulfentrazone product.

Where do you live?

I don't see any broadleaf weeds in the (blurry) picture, so 24d won't work. If it is crabgrass then a crabgrass killer is what you need. But without a better picture it would just be speculation. If you wipe the camera lens before taking the picture that might help. Good that you took it on a cloudy day, though.

Well in my experience, beaning a herbicide pesticide applicator. The store bought stuff is junk. At this point you're going to be mixxing chemicals if you put any thing else down. It will take at least a month for chemicals to dissipate depending if what you used was petroleum based most likely it was. I would contact a local landscaping business or the state run master gardeners group in you're area.

Weed and feed is junk. Don't use it.

Looks like crabgrass. You will need quinclorac to kill it. It is safe for fescue when applied according to label. You got some broadleaf stuff in there too.

http://www.domyownpestcontrol.com/q4-plus-turf-herbicide-p-1930.html

Should take care of everything.