The graph module has been updated recently, you should now have “graphs” as an option in the navbar “setup” ie
Inputs
Feeds
Graphs
Dashboards
and there should be a save button and graph selection dropdown at the bottom of the lefthand panal, see the Emoncms Graph module developments thread.
Can you update the graph module? either manually doing a “git pull” or via the “emonpi update” if that’s what you’re running?