The partner slot refers to the images of the merchants or suppliers you partnered with for this online store. They are located near the footer of the online store.
To increase the number of partners, simply click on the Number of Partners dropdown menu to choose the number. The images can be configured in the same way as the banner slot, where a working image URL or website link is respectively added into the suitable blanks. Learn more about converting image files to image URLs.
After you are done adding the images, remember to click the green save button at the bottom and press preview to see the changes in the preview site at the side.