There should be pins before you purchase something so when your account gets hacked, you can't lose robux.
You go on settings, and if you want to enter a pin, you can enter a pin you want, for example "0000". When you go to the catalog and purchase something, you enter your pin in, then after you put your pin in, you're finished. This can decrease loss of robux when your account gets hacked, or brother/sister gets into your account and wastes your robux.
If you want to change your pin, you type your old pin in at settings, then type in the new one. |