First - remember that there is a column and a component option in Kartra. Each will enable you to edit different page features. Sometimes you will need to switch to column in order to access more details such as margin.
Each image has 4 orange setting boxes on the top right side of the image. In order to access them you just need to hover over the image and wait for them to appear.
If you find that the image settings don't appear they may be blocked by another image. Try increasing the background margin. You can access these settings from the right side.
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