Answer for Read More tag not working : <!–more–>

Hey i’m working at the moment at a local server for building up everything, so at the moment i can not send you a link of my stuff…but here you see how the tag is working: https://en.support.wordpress.com/more-tag/view-all/
The plugin i’m now using is working pretty good, it’s this one http://www.jamos.ch/plugins/wp-show-more/