I'm confused with this new w4 form I want to lower my dependents from 7 to 3 How would I do this?

Personal exemptions are no longer used when completing a W-4.

Go to this IRS website for the tax withholding estimator (W-4) -https://www.irs.gov/individuals/tax-withholding-estimator

What line would put that in on the form?

All you need to do is follow the procedure in the estimator for the W-4.  In Step 3 you enter the credits you are eligible to receive.  The number of dependents is no longer relevant on a W-4

Also, see this IRS website for withholding estimator FAQ's - https://www.irs.gov/individuals/tax-withholding-estimator-faqs

I'm sorry with all these questions 

On section 3 I would put $1500 because I claim 3?.. 

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@fastrek82 wrote:

I'm sorry with all these questions 

On section 3 I would put $1500 because I claim 3?.. 

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If you have three dependents being claimed on your federal tax return and they are all age 17 or older, the Other Dependent credit of $500 would be available for each of the dependents, total $1,500.

Thank you!