In reply to 2017
A majority of issues come at sign up when they try to create/edit their profile, upload or edit their profile pic (I've been using Dolphin for a few years and I even get irritated), avatar, etc. This stuff + navigation at the beginning are what turns them off immediately because it's not intuitive and they frankly give up. It has to be totally simple.
Below is the legacy version of the Boonex site, maintained for Dolphin.Pro 7.x support.
The new Dolphin solution is powered by UNA Community Management System.