Modify the guestbook module or build a custom module?
Jamroom Developers

Hit us with specific questions where you get stuck. Open a thread for each question, let us solve it and open another thread for the next problem.
Mammoth threads never get read and quickly get confusing.

Start by setting up the module structure with an include.php file, then try to turn your module on in the ACP.
Look at the other modules as a guide.
--edit--
ah, and turn on developer mode so you dont get caching issues
ACP -> TOOLS -> DEVELOPER TOOLS -> GLOBAL CONFIG -> RUN IN DEVELOPER MODE
updated by @michael: 01/15/19 07:52:18PM