How Send payment from paper XPR wallet?

[fulvio-morelli]

Dear, I need help to understand how send payment from http://yxxyun.github.io/#/Payment . I write my pubblic address and I can see my xpr amount on wallet. 

Receipient It's destination account wallet, ( destination insert If receipient have it)

Value: total of coin that I must send

Currency: type of coin

Issuer: here I must insert pubblic key? or  Secret key?

Or to send I must insert secret key into set wallet account?

 

Thank to all to help me