Huh, interesting. On my profile there's always a link to the submission page from Profile > My XTU Profiles.
Anyway, it will still work. Just a bit more clicks. So, go to your profile > My XTU Profiles tab, then click on Analyzed in the table. This will bring you to the Analyze page for your XTU profile. On that page, click "Details", which brings you to the submission linked to the XTU profile.
On the submission page you can find the delete button on the right hand side in the sidebar.