Go to CALENDAR and locate the email you'd like to use.

Hit the arrow key on the right side of the email you'd like to use to access the content.

Choose the section in your communication that you'd like to insert an image, then click on the mountains icon (Image). 

This will then open a pop-up browser. Click Browse Server to browse through your computer files for the image you'd like to upload. 

A new pop-up window appears (File Browser), click Upload.

This will open a small window where you can click Choose File to open your computer's files and locate your image file.

Locate your image file and open it.

Click Upload

Click Insert File

Click OK and you are done!