How to add transparency to an image?

To add transparency to an image first get into the edit mode and click on the pencil icon of the image widget. Next, Click on the image effects tab. Next, adjust the transparency with the slider or enter the percentage for the transparent image.

Here is how to add transparency to an image:

Step 1: Click on the pencil icon of the image widget. 
Step 2: Click on the image effects tab. 
Step 3: Adjust the transparency with the slider or enter the percentage. 
See images below: