configuration page

[eluser]einsteinity[/eluser]
hi, i need ideas on creating configuration page which is controlled by admin..

for example, for every vote, user will be credited with extra 5 points.
i want to create a configuration page so if admin want to change that credit value,
he can do it from that configuration page directly.
so there will be a form to update the value.
if admin input 10 to the input form and he submit it, for every vote, user will be credited with extra 10 points.

how to create something like this in CI?