Partner post type will display your post as image. You can display it with page builder partner. You must create 1 post for 1 partner image.
Step by step :
1. You must fill title form even the title not display.
2. Featured image will display as Logo Partner.
If you want to add partners more or less than 8, e.g 6 partners,
you can edit by yourself by
Go to Setting > reading > post per page to 6
But it will change the display of portfolio and blog loop also.