Top up Psn credit without a family manager?

When I try to top up my little brother's credit, I get this message:

Can I do

against it?

Ask the family manager.

Go to the family manager and if you can't, leave the family.

But of course the Playstation family is not your family.

I'm the manager, but how should I charge it?

How does that work if I may ask? And do you lose your things there?

Do not have a Playstation, you have to look in the settings, otherwise check out YouTube.

Well if you were the family manager then you can charge it too.

The profile that is the family manager must top up the account. The family manager can also assign how much credit another profile can spend.