My shop is not open, why?

Short answer: Two possible causes, and hovering the red cart tells you which: the shop address still contains the word demo, or one of the logos placed on its products is not of sufficient quality for printing.

In the "Activation + Shop address" section, the cart is red. Hover it: the tooltip names the cause, and both of them if they are present together.

The tooltip reports that the shop address contains the word "demo", and advises: "Edit the shop (orange button at the top right) and change its address to activate it."

Every shop built as a demo is given an address ending in -demo-NNN. As long as that ending is there, the shop stays closed.

Solution: create a draft with the orange button in the action bar, click the address and replace it with a short subdomain, without the word demo. Then put the draft into service. The detail is in How do I set my shop's address.

The tooltip reports that some logos in use are not of sufficient quality, and names them. It advises uploading a logo with sufficient resolution.

The check only covers logos placed on products in the shop. A web-quality logo can sit in My logos without blocking anything, as long as no product uses it.

Solution: obtain the print-quality file and replace it inside the existing logo. See Some of my logos are not good enough quality — what do I do.