To hazard a guess, I think people are misconstruing the linking part as posting the link to the main topic in there MOC topic page, assuming it will then notify the main topic of their entry, which is incorrect.
Suggested rewording:
“In order to enter, a new topic must be made for the creation with (Meet the Maker) in the title. Copy and Paste a link to your topic into the “BIONICLE Canon Contest #2: Meet the Maker” main topic to officially enter your post”
-Solaris Magnus