How to restore deleted my own admin permission

I almost completely setup the cloud YouTrack, but at the last stage I wanted to see the projects as ordinary users see them, and I deleted the administrator role in this project for my own account.

I managed to see everything as a ordinary user, if you know what I mean, but now I want to return the default permissions for my account. How I can to do it? We have no other admin. My account is still called root.