Webpage test from url (or start test from URL)

How do I start a webpage test from URL? So for example, a typical result might look something like: https://www.webpagetest.org/result/200701_PS_0e90ddfe7fa69c1dcd19c2bb5aaf0a31/

but how do I start a new test, trying something like: https://www.webpagetest.org/result/mydomain.com and after the test is started or completed, it would just redirect to something random generated like my first link.

Thanks for any tips! I used the search box but couldn’t find anything like this already posted. Maybe I’ll start a thread in the feature request forum…