OK, it’s not bad - we just need to isolate the problem
You can create a ‘collection’ that you get to name and then mint all your new pieces within that collection; so instead of the piece saying it’s owned by Rarible (or whatever) it will say owned by xyz
Some people use it as a higher standard for their brand and it can be quite effective but the caveat with that is it’s more useful when you have a good, strong, network of potential collectors
So, you haven’t done that; next question is - with your profile page open and you’re looking at your minted edition, did you click on the three dots in the top right corner on the NFT and choose from the drop-down ‘change price’ which activated the next step as shown in this image
And after that you would have had a pop-up that said ‘set price’ (sign message to set fixed price) and a request for you to sign the order?
PS - what was the cost of the gas fee?