You should be able to access the admin. menu by the buttons.
press the hr meter and sph together till it beeps,
then the clock till beep and the clock again beep,
then hr meter and sph till beep.
It's possible there is an additional password needed that has been added which only that person knows.
You can then scroll to the speed limiting feature.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.