Add the Phish Alert Button as a quick action.
With an email open, select the 3 dots on the top right of the email.
Select Customize actions.
Check the "Phish Alert" option under Apps.
The Phish Alert Button will now be an option in each open email, appended to the top right menu bar.
Phish Alert Button not appearing as an option?
On the left hand menu, click the waffle menu icon labeled "More apps."
Then click "Add apps."
From the section labeled "Built for your org," select the Phish Alert by KnowBe4, Inc option.
Alternatively, search in the top left search box for more apps, "Phish Alert."
Select Phish Alert and click "Add." If the app is already added, it will have the option to "Open."