If you want to make a Creation Cache, the first thing you need to do is become a member of this site. There are 2 sorts of members: Basic and Premium. Basic membership is free, but Pro membership costs $20. This $20 fee goes straight to the Mount St Helens Creation Center, who administer this game. Basic members can find creation caches, but in order to add your own caches to this site, you need to be registered as a Pro member. The $20 fee is a one-time fee, not a renewable annual fee. You will not be asked to repeat the fee. However, Creation caching reserves the right to introduce a higher level Premium annual subscription at a later date, which will provide extra services and features.
This section of the site gives tips on placing and preparing Creation Caches.