Adding your own photos to Brand Kit designs is simple — here’s how:
From the Brand Kit home, click the design category you're looking for (e.g. Social Covers > Facebook). Then click a design you want to customize and the Brand Kit editor will open in a new tab.
Click the image in the design (note: if there’s no image, you can always click on the background to add an image from the left menu).
In the left menu, click Replace Image, then select Upload. Navigate to the image you want on your computer, then click Open.
4. Click Apply Image to add it to your design. To make adjustments to your photo, you can use the Reposition/Resize/Filters options in the left menu.
5. You can also scroll to the bottom of the left menu to adjust the transparency of the image.