Contact User in Profile "Button: Send Message"

Hi !
In my community Builder instance, I see the possibility to contact user when visitign his profile by sending an email message...
Where can I adapt these Fields? I want to as some fields and put some custom code into this...

(no pm messenger installed)

Thank you in advance

You need UddeIM to use "Send Private Message" menu link. It shouldn't even be there if you don't have a supported PMS installed. There's also "Send Email" if you've primary email in CB configuration set to Email Form. Aside from that I've no idea what you're trying to do; please be more specific.

Thank you for your reply!
I want to ad an additiona field, which is sent to user.
I do not want use IM Tools like uddeIM. It is not solving my needs.

---More detailed---
In next step I want to ad a script to this field, which saves the requests whcih where sent to user with
- Topic
- Message
- extea field 1
- extra field 2
- date time
- if possible with ip
- and a specific value we like to fetch with any cookie or something... (this is a vlaue which is given by user search...
--> User A has checkboxes mit values pizza, spaghetti and wine.
USer B searches User list for users with Spaghetti
-> USer B contacts User a and the value Spaghetti musst send and also saved in Database with above fields

So the Contacting from USer A to User B should be visible in statistic with report which fileds where entered and also selected.

Looking forward to your reply... very intersting topic for me

As far as I am aware you can't unless there's some sort of PMS extension to allow custom fields. CB doesn't handle the messaging, that's all done by UddeIM.