I’m using my husband iPhone , he already have an Apple ID on that phone,Now I want to sign in my Apple ID . How to change

Thanks for participating in the Apple Support Communities, shanmuga128.

We understand that you want to sign out of your husband's Apple ID, and sign in with your own. Let's see how we can help. It appears that restrictions are enabled which is stopping your from being able to sign out. This means that restrictions would need to be disabled for this change to be made. Learn more here: Use Screen Time on your iPhone, iPad, or iPod touch.

Some things to keep in mind when signing out of iCloud on a device: Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac.

Best regards.