Am I able to add "Signature Require" after creating a shipping label?

[DTN107]

So a buyer bought one of my video cards and has zero feedbacks on heat and ebay.

My dumbass went ahead and create the label when I saw the payment. I did add insurance (USPS) to be safe on that part.

I tried looking around USPS website to see if I am able to edit the label but I did not find anything of such. I rather not cancel the label if possible.

Would you guys think it is possible for the post office folks to add in "signature require"?

 

[DPOSCORP]

If you take it to USPS, they can add it.
If have done it before.

 

[livfree]

^ This. They'll add it but it has to be in location and it depends on how they're feeling.