I managed to not answer the install questions correctly. This resulted in an unrecoverable error after hitting the configure button.
I now know, that since I am doing a XenForo integration, I should NOT have left the forum db prefix question blank, and that it should be 'xf', probably the same for the cookie question.
I was also confused on the db theory in general. I thought it was advised to install in the forum db, rather than use two separate db's.
Does Classifieds need it's own db or can it run with prefixed tables in an existing forums db as I have managed to do.
I did specify an alternate prefix for the Classifieds db, but pointed the install to the forums db. And I do now have a set of tables, apparently new, with the Classifieds prefix, along with my xf_ prefix tables.
I have looked at my now existing 'config-inc', and there are no lines to edit for the forum prefix or cookie prefix, probably since they were left null.
What is the best way to fix this ?
I have built another mySQL db for the classifieds if need be.
Do I re-run install.php ? 'Click here to run a 'fresh' install."
Or are there other files I should edit manually instead ?