In the marketing piece, click on the Image area that you want to link. This will open a Content Properties area on the right.
In the Image Name area, click Apply effects & more
Click the Shapes content option, then click to add in a triangle. Rotate the triangle to resemble a play button. Click Apply.
Use the Settings button to adjust the Color and Opacity of the "play button" if desired.
DON'T FORGET...
to link your new image to a web page.
In the template, click on the Image area that you want to link. This will open a Content Properties area on the right.
Scroll down to the Action section.
Paste the desired link in the URL field.