Fork the TW5 repository to your own GitHub user account, and then clone it locally.
Then checkout the "tiddlywiki-com" branch via git command line. (This branch can live push updates to the website, and not wait until the next Version release).
Then, run the node command given in the `bin` scripts folder:
This launches the "tiddlywiki-com-server" Edition (from the 'TiddlyWiki5/editions' folder) as a node process.
Navigate a browser to
127.0.0.1:8080. Make changes to documentation tiddlers. Push your changes back to your fork.
From GitHub, create a Pull Request from your fork of the "tiddlywiki-com" branch to the official repository's "tiddlywiki-com" branch. Describe your changes in your PR.
The community can then review those changes, and Jeremy can merge if it all looks good.
Best,
Joshua Fontany