JuiceboxBuilder Tour: https://www.juicebox.net/tour/juiceboxbuilder/
JuiceboxBuilder User Guide: https://www.juicebox.net/support/juiceboxbuilder/
Getting Started Guide (inc. 5 minute video): https://www.juicebox.net/support/#getting-started

Then, you can either:
(1) View the gallery on a web page of its own by opening the 'index.html' file (inside the gallery folder) in a browser.
... or:
(2) Embed the gallery into an existing web page (alongside other content) by following the instructions in the Embedding Guide: https://www.juicebox.net/support/embedding/