[TYPO3-english] TYPO3 and EXT: Powermail prioriCalc to confirm mail

[Thomas Petersen]

I have a TYPO3 ver. 6.2.2 setup with the extension powermail.

I have some fields in a form thats hidden and then some that needed to be filled abd then the user can submit the form and the use will then receive an email.

I can in typoscript say something like

plugin.tx_powermail.settings.setup.prefill {
anner = TEXT
anner.value = 4+5
anner.prioriCalc = 1
}

And then the indput field in my form with the name=anner will have the value 9.

My question is how can I take the fieldname Totalpersonsand then say +2, and then make a field {totalpers}for my powermail mailform so i can add the value to the mail I send after submitting the form, so I can use that value in the mail, so how can I make that calculate and how will my typoscript look like.