So I've imported a sprite to use as an enemy in my game, but when I create it it's background color remains?

So how do I remove the background color? I've searched everywhere but can't find any solution.

Within the Resource Manager when you've imported the monster graphic you'll see this screen:

Use the left click to make the colour selected flash, this indicates that this colour will be transparent. Use the Zoom In option to easily click the colour needed.