Get yourself a spreader and a quality "Weed and Feed" from your local home improvement store.
Spend some time on Google to find out what would work best for you.
Follow the directions! (what time of day is best to use it, wet the grass before applying, follow up treatments, etc)
You'll likely have to re-seed once all the weeds are killed off, since they are likely taking up more real estate then the grass right now.
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"Speak softly,..." -Pres. Teddy Roosevelt
"Be polite, be professional, ..." -Gen. James Mattis
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