My iPhone 7 Plus screen is cracked, where i repair it? And what’s the charge for it, plz help me,

Screen damage if determined by Apple to be accidental is not covered by the regular warranty. If you have Applecare Plus you get two accidental damages/incidents for the life of the warranty at reduced cost.

iPhone Repair - Screen Damage [and links to other iPhone repair services] - https://support.apple.com/iphone/repair/screen-damage - includes pricing.

iPhone Service Answer Center - https://support.apple.com/iphone/repair/service - "Learn more about iPhone service options, warranty, and pricing." Repair times.

Genius Bar appointment - Go to https://www.apple.com/retail/geniusbar/ > Get hardware help > iPhone > Repairs & Physical Damage > Screen is cracked > Bring in for Repair --> Sign in with Apple ID

Location? It’s the one thing needed to give you a better answer. Pricing varies by country, and in some cases there no set price because Apple doesn’t directly perform the service.