Using TradeTrax is easy and straightforward. Once started, the entire application is controlled via your web browser, so you don't have learn any new UI concepts.
Every page has a sidebar with two boxes in it "Instructions" and "Find asset by id". The instructions provide a quick description of the page, while the Finder may be used to directly look up a specific asset in the ledger by it's running number. The id 0 is special and can be used to create stock instead of editing it (likewise, when trying to look up non existent stock ids). You'll also notice that the default id in the finder is automatically set to the asset id, you worked with last, providing a convenient way to go back and fix potential mistakes.
If ever you find yourself unsure what an element on a page means, try hovering the mouse of it see an explanatory tooltip.