You may have created a custom page and noticed that the URL is something like mypodpage.com/p/name-of-page. This cannot be changed. However, if you are wanting a cleaner-sounding URL that you can say on your podcast, you can create a pretty redirect that goes from the URL that you say on your show to the actual page.
For example, on your podcast, you could say "Go to mypodpage.com/name-of-page" but that will redirect to mypodpage.com/p/name-of-page.
You can set up Pretty Redirects by clicking on Publish → Pretty Redirects → New Link → Save