Sci Hub is a "pirate" website with 88M research papers freely available.
Using it is not advisable. We should all try to make billion-dollar acdemic publishers richer.
Here's a thread on integrating Zotero with Sci Hub to get free articles.
PLEASE DON'T DO THIS 😉

1. Don't go to this link:
github(dot)com/ethanwillis/zotero-scihub/releases
But if you want to, please change the spelled word "dot" with an actual dot.
Once the link opens, don't click on zotero-scihub file. This will download an xpi (pronounced "zippy") file to your computer.

2. Don't open your Zotero but if you do, click on "Tools."
In "Tools" menu, click on "Add-ons." Zotero wil open its Add-on Manager for you.
Click on the gear-like icon in the top-right corner and then select "Install Add-on From File."
Now navigate to the xpi file that you just downloaded and open it.
This will install the Sci Hub add-on in your Zotero. You shouldn't have done this.

3. Now don't try to see if the Sci Hub add-on is configured properly.
But if you want to, click on "Edit" and select "Preferences."
In Zotero Preferences, click on the "Zotero SciHub" tab. The URL should be sci-hub(dot)live

4. Don't go to an acdemic publisher's website with a billion-dollar annual revenue.
But if you do, copy the DOI of the article you want to read.
Next, go to Zotero and click on the magic wand-like button on the top. This will let you enter an article's DOI.
Don't paste the DOI of the article you just copied because Sci Hub will go and retrieve that article and add it to your library.
If you have downloaded this article, don't open it because then you will be able to read it.

I hope you don't try this at all.
Don't tell any of your friends either 😉

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Since a lot of folks are planning not to integrate Sci Hub with Zotero, here's a complete tutorial as a single video.
Feel free to download it so you can avoid doing it. Good luck!