Go into phpmyadmin and in the phpbb_config table delete the row that you entered.

Thanks but now I'm thinking I may want to keep the MOD for phpbb installed. The problem is the list of users online for the past 24 hours displays in a very long narrow column instead of across the page.
See the example in the forum I am working on here:
http://www.chadzboyz.com/chadforum/   then scroll down

Is there a way to adjust the table of online users in the last 24 hours so it displays across the page instead of vertically in a long narrow column. I'm not that familiar with phpmyadmin but I can try It seems I need to change some table parameters somewhere in the two tables created with the above SQL.

Ahhh, thank you so much...that did the trick