Not able to add fund in my Apple ID

Hey there himmatsingh04,

Follow these steps to learn how to Add money to your Apple Account balance - Apple Support. Since it looks like you're using an iPhone, you can follow these steps:

Add funds to your Apple Account balance on iPhone or iPad

1. Open the App Store app.

2. Tap your photo, initials, or the sign-in button  at the top of the screen.

3. Tap "Add Money to Account."

4. To add funds instantly, tap the amount that you want to add. Or to automatically add to your balance in the future, tap Set Up Auto Reload. What's auto reload?

5. Follow the onscreen instructions to complete the purchase. Some payment methods might prompt you to verify your purchase with a text message or other method.

If you are using another device type, review the page to find the steps that will suite the device being used. There are steps or adding on from an iOS device, a Mac or PC, or how to set up to add on automatically.

Best wishes!