This guide walks you through adding the certified ZINT connector to a Microsoft Copilot Studio agent, end to end. Each step has a screenshot below it.
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A ZINT account with an API key. Create one at https://data.zint.io under your account's API keys.
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Go to https://copilotstudio.microsoft.com and sign in with your Microsoft work account.
Screenshot:

After sign-in you land on the Copilot Studio home at https://copilotstudio.microsoft.com. A few things to know about this screen:
To add the ZINT connector, an agent needs to exist to attach it to. Open an existing agent, or create one from this screen. The next step covers creating one.

Screenshot: the home page at https://copilotstudio.microsoft.com showing the left rail (Home / Agents / Flows / Tools) and the "What would you like to build?" box.