Download the .jar file using the button above and save it in your Downloads folder.
If you already have Java, you can just double-click on the file you downloaded and it will run.
If that doesn't work, open a Terminal and type:
java -jar rabbit-escape-*.jar
(Make sure you type it exactly right, including capitals.)
If the Rabbit Escape window doesn't appear, you may need to install Java: read the next section.
If you can't get Rabbit Escape to work, please contact me on email@example.com and I'll try to help.
If you can provide instructions for a different Linux distribution, or you can help improve these instructions, please let me know.