The appear.in block is part of Airtable Blocks, a Pro plan feature. Blocks let you extend the functionality of your bases: you can use blocks to bring new information into Airtable, visualize and summarize your records in colorful ways, and even directly integrate your Airtable bases with your favorite apps.
To set up the block, you'll first need to sign up for free with appear.in and set up a room. Next, add an appear.in block to your base, and specify the appropriate URL for your appear.in room.
Once you've set up your appear.in block, you can click on the button inside the block to jump into the video chat.
If you're having trouble operating the appear.in room, you can look through appear.in's support library for further assistance.