From stage under the preloader tab in the properties. Click on Edit
Deleting the contents under the preloader symbol from the elements panel will remove the preloader.
BTW, what issues are you facing using the preloader
The problems I was having was that the page would not load. It would hang sporadically on the preloader. Try hitting refresh several times on a composition & see if you can duplicate my problem. This was a brand new project from scratch with very little animation or elements & a very short timeline - 10 seconds. It did it on more than one project too. I did upgrade my Edge Animate from an older version so it was not a totally new install.
When i took out the preloader my problems disappeared. And that included the project that I used your answer on. Thanks again, sometime i am blind.