I am very much indebted to my friend and IT ex-colleague James (Tanathka on the forum).
He offered to support me as I upgraded this (SMF Simple Machines) forum software (and of course hes the guy who set his forum up in the first place for me
.)
I took all the backups and started the job under his telephone guidance, but ran into technical problems
in attempting to go from Version 1.4 (or thereabouts) to Version 2.
We worked on it to 3am, and James offered to take over from his computer next day using my backups.
In the end, it wasn't possible to jump to version 2, as my host does not have the latest version of mySQL and PHP.
James succeeded in upgrading us to SMF 1.1.15.
Hopefully this will address some security issues.
Three cheers for James