How to create a Transparent Background image in CorelDRAW 18

Hi, I am new to CorelDRAW 2018, and I created a new a new crafting and sewing illustration for https://embroik.com/embroidery-on-hat/ with the help of CorelDRAW, but the issue is when I uploaded the illustration then it is not transparent. What should I do so that the image is trasnparent? Thanks.

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