Initially, you can access GroovePacker Lite from your Shopify Apps list.
For day-to-day use it's handy to have a Shortcut in your bookmarks bar and it's super easy to add.
First, launch GroovePacker Lite from the apps list and you should see the homepage.
The link at the top left of the page can be dragged to your bookmarks bar:
Once it's there you can right click on it and rename it anything you like: