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Dialog
The best way to interact with Hopplet's functionality is via the built-in dialog interface.
With no item in your main hand, sneak and right-click a hopper or hopper minecart as though you were going to open it to view its contents. If you have permission to edit this hopper, an interface will open that looks like this.

Following the Syntax and Functions pages, you can design your desired filter and put it into the text input box labelled "Filter Input".
When you think it is ready, press the aqua-coloured "Validate" button.

Oh no, something went wrong! As you can see below in red, we have a syntax error... Can you see the issue?

We were missing a " after Fruitloopins. That's an easy enough fix. Lets fix it and validate again.

Perfect, it compiles now. Lets press "Confirm" and try throwing a book in.

If you need help writing or designing a filter, don't hesitate to join the Discord posted in the dialog interface and ask.