Shorter URLs on seasidehosting.st

Trying to set up a site at chaetal.seasidehosting.st and provide "shorter" URLs (like http://chaetal.seasidehosting.st/about instead of http://chaetal.seasidehosting.st/pier/about) there I've encountered a problem. All the tutorials, manuals, FAQs I found say something like "select your preferred application as default entry point and set the base-path of your application to "/". I do that but Seaside says (for example) "/seaside/about/ not found" when I click "About". I don't remember how we solved this in earlier versions of Seaside and Pier. And I'm not sure about who is actually responsible for this: Pier, Seaside or hosting… But I don't see any opportunities at seasidehosting to do what I want at web-server level. So, how can I do that with Seaside or/and Pier? TIA -- Dennis Schetinin