0.Load the the files in the infusions file.
1.Open maincore.php and write completely in the end approx. the line 610: include INFUSIONS."wob_rank_system/func/func.php";
2.Install the infusion.
3.CHMOD the file "images" to 777
Example to insert the rank system:
echo getRank($userdata['user_id']);
The function only need the user_id to show the rank ( getRank(USER_ID) )