If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
It is possible but the only access they would have would be through your login details. This means that your site could be crashed by inexperienced users or at the far end of the scale all your sites could be ruined if people went in to play without understanding the processes required to protect the site files.
Yola don't have a multiple login per account facility with various levels of access.
Adding information to your site as a user is not possible. You can allow comments, you can set up a forum but these don't allow the addition of primary content as such.