Hello and welcome!
Did you try the steps in this blogpost? https://blog.trello.com/trello-add-in-for-outlook
To start using the Trello add-In for Outlook on the web, click Outlook's gear icon in your browser and select “Manage integrations,” search for Trello, and turn on the Trello add-In. Now, whenever you open an email in Outlook there will be a Trello icon in the top right corner of the email. Click the icon to create a new Trello card from the opened email.
To get started with with the Trello addin for Outlook on iOS and Android, go to Outlook Settings > add-ins, and tap the ‘+’ sign next to the Trello add-in. Now, when you open an email, you will see the add-in icon in the email header. Tap this to launch the Trello add-In.
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