how can i buy the applecare

This is what you might be looking for:

Buy an AppleCare plan in Settings

1. On your iPhone, iPad, or iPod touch, open Settings.
2. Go to General > About.
3. Tap AppleCare+ Coverage Available. If you don't see AppleCare+ Coverage Available, check to make sure that your device is eligible.
4. Follow the onscreen instructions to complete your purchase. You can
5. see the price of the AppleCare plan when you follow these steps.

https://support.apple.com/en-us/HT202702

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