New Member, Looking To Simplifiy My Website Address, How ?

Just joined this site, it's excellent, we have lots of images to add and adjust. When I signed up for the premium features I am pretty sure it said I could customize the URL of my web site, trouble is I can't find how to do it. I want to keep things simple, so instead of https://dyscrete-pics.pixels.com I want to change it to https:dyscrete.pixels.com can anyone tell me how to achieve this ? Thanks !