myCRED is a free plugin developed by other author, this is not our plugin, myCRED plugin support is being done in support section like all WordPress plugins, here: https://wordpress.org/support/plugin/mycred
wpDiscuz is also free plugin developed by our theme, also we've created wpDiscuz myCRED Integration paid addon to allow myCRED and wpDiscuz work together.
So all issues related to myCRED should be asked myCRED author and all issues related to integration should be asked here. Now we see jus myCRED issue, for some reason this plugin setting menu is not there. This may be caused by other plugins, please ask myCRED author for support, he should know why this it doesn't work. Here some example of such support he made: https://wordpress.org/support/topic/mycred-disappeared-on-dashboard?replies=19
We recommend to deactivate all plugins one by one and find the one which affects myCRED sidebar menu. This is a plugin conflict for sure.