Click on the + button and select Upload a presentation

Select the present button 

Drag your presentation into the upload area or browse your files to select your presentation to upload

To make your presentation downloadable, enable this download option. To not make your presentation downloadable, de-select this option

Select the circle icon of the file you want to upload. A checkmark will appear on the one you are uploading

Select the trash icon to remove or delete a file from the upload screen

When you have uploaded your file and have your settings set, select the Upload button at the top

Select the annotation tool you would like to use (hand, pencil, rectangle, triangle, ellipse, line or text)

Select the size of the your drawing tool

Select the color of your drawing tool

Undo and annotations made

Clear all annotations

Turn on multi-user whiteboard