[Simon Lloyd]

Admincp>Styles & Templates>Styel manager>YOUR FORUM STYLE>mrnasesimilarthreadcheck_header wrap all those contents in the if condition (i.e change "CODE FOUND IN TEMPLATE" for the code actually found in the template (don't forget to chage 1,2,3 for the actual forumss you want to show it in)), hit save and do the same for the next template i mentioned, then go to the mod settings and allow all forums, the similar thread thing should now only show in the ones you specidied in the if condition.