Move last connection to contact list

Hello,

I am using TeamViewer for a number of years now and have faced a problem that is solved for sure.

I have a support session with a new client or new compter. Therefore I type in the long ID and the password. After the session I would like to move this very same client to the contact list.

I cannot find any button etc. and cannot copy the long ID to the clipboard to take it from there.

Please advice

Thanks

Niko