how i can reset my passcode

Hello kshama from jodhpur,
Thank you for using Apple Support Communities. I see you're needing some assistance resetting the passcode on your iPhone. I know how important it can be to protect your data. I am happy to help.
To change your passcode go to Settings > Touch ID & Passcode. If you don't have Touch ID go to Settings > Passcode. If you have forgotten your passcode, please follow the steps in the link below:
If you forgot the passcode for your iPhone, iPad, or iPod touch or your device is disabled
Here's some additional information about passcodes:
Use a passcode with your iPhone, iPad, or iPod touch
Have an amazing day!