I'd start out using a Found Image condition to click the arrow – then type-select to get to the correct sub-menu – then a keypress to finish up.
If you're using Safari or Google Chrome or one of their variants that is scriptable then it may be possible to use a Execute a JavaScript in Front Browser action to perform the desired action, but that gets a trifle complicated.
I had been trying to use Find Image with a screenprint copy of the text I wanted clicked on - text does not seem to work with Find Image however. . I changed to only the icon and that worked fine.
If you are running the Outlook 365 Mac app, then this macro should do the job:
MACRO: Forward Outlook 365 EMail to Specific Recipicent [Example]
**Requires: KM 8.2.4+ macOS 10.11 (El Capitan)+**
(Macro was written & tested using KM 9.0+ on macOS 10.14.5 (Mojave))
#### DOWNLOAD Macro File:
<a class="attachment" href="/uploads/default/original/3X/3/b/3bacc94fb22ac7b0a227bf3d529259cc9fa5aab8.kmmacros">Forward Outlook 365 EMail to Specific Recipicent [Example].kmmacros</a>
**Note: This Macro was uploaded in a DISABLED state. You must enable before it can be triggered.**
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<img src="/uploads/default/original/3X/6/3/6330299bef8b1ba6cc5b329aeb5c7eca6bd8cc69.png" width="603" height="1012">