Failure during execution of installation

For a first installation of OpenMeetings, I was following the installation procedure "Installation OpenMeetings 5.1.0 on Ubuntu 20.04 lts.pdf", 17 pages, attached.

During execution I was a little to fast at the point on page 13 (= "Pag 12"), where it is written "Don ́t clic on Enter the Application.", I did click on it.  I did not restart the tomcat3 server but did my first login ...

Some time later, I realized the "Don't ...", but then it was already too late.

I believe something went wrong. The question is: what do I need to do now?

• Is it possible to erase my current account and do a new setup?
• Trying to use the application shows, that upload of documents to a meeting, e.g. a pdf, leads to a failure. Upload is possible, but the pdf can not be shown.