Go to the SOA Sandbox for reuse main page at http://www.ibm.com/developerworks/downloads/soasandbox/reuse/. Once there, simply follow the prompts to start the online trial (you'll need an ibm.com ID to register). Once you've gone through the registration process, you'll be brought to the Trial Environment selection screen. If this is the first time you've worked with a hosted trial, you'll need to download the Citrix Metaframe presentation client (the link is on the page), then you can click on one of the available applications (below) - the RAM one is called "Governance of Reuse".
Once the application starts up (and it's very quick), it's just like using the native app. Follow the guidelines in the cheat sheet for a complete SOA scenario, or just explore for yourself. The cheat sheet is shown on the right in the image below.
So what are you waiting for? Go explore!


