how to add a certain amount of money on your account

You can buy a 15$ gift card from any local shop, or online. Also, you'll need an extra 5$ to cover up the tax.

The lowest amount of money you can add to your account is 5$ with a prepaid card.

It would be nice to add this kind of option to the lab, but I think it would be very expensive, just adding a nickname to the laser costs a certain amount of money.

Still amounts to how, its your money on your account, seems a bit dodgy

Hi. My name is Brilliant and I am happy to assist you today.

Here are tips on how to add money to your family member's Microsoft account.
1. Using a web browser, visit family.microsoft.com.
2. Sign into your Family Safety account.
3. Find your family member and click Add money. You can also click More options > Spending > Microsoft account balance > Add money.
4. Select the amount of money you would like to add to your family member’s account and click Next. 5. Select your form of payment or click Add a way to pay.

For more details on the above, kindly visit: https://support.microsoft.com/account-billing/add-money-to-your-family-member-s-microsoft-account-d2a4d821-4d8b-fe19-49f1-c21d51f18aa7">https://support.microsoft.com/account-billing/add-money-to-your-family-member-s-microsoft-account-d2a4d821-4d8b-fe19-49f1-c21d51f18aa7

If the following does not help, kindly reach out to Microsoft Support as advised: https://support.microsoft.com/

I hope this helps resolve your query.