Contact Support to ask them to change it.
Please elaborate.For spending diamonds, you can do it yourself.
OK. Now I understand the statement.You can disable the confirmation popup that exists that asks you if you are certain or something like that before you spend diamonds. This helps prevent accidently spending of diamonds due to misclicks. Agent's saying that if you choose to disable that popup in your settings that you can go back into settings and turn it back on so that the confirmation popup comes back.
Or are you asking how you can turn that back on specifically?