Mandatory custom fields / amending the entry-information line

Hi Marcel,

Ive got an issue of which I think must be easy to solve so I would like to ask for your help. I really appreciate your commitment to this project!

1) I am trying to amend the entry infomration line. I have installed simple WP membership plugin, where members can add their streets and it would be great if I could include the “street” field of the users profiles to the guest book.
The current one is:

“[Username] wrote on [Date]:”
I would like to amend this to be:
“[Username], [value of the “street” field of the users simple WP membership profile], wrote on [Date and time]:”

2) If a connection between simple WP membership and the guest book is not possible, which I assume, I would solve this with a mandatory address field in my form. But how can I make the custom address field mandatory? And is it possible to then amend the entry information line to be:
“[Username], [value of the mandatory custom address field], wrote on [Date]:”

Please note that issue number two only applies if there is no solution for issue number one. So one of both can actually be ignored. ??

Many thanks in advance and best regards,
Hans