Guideline on Graph not showing?
 

Hi guys, I am new to this and downloaded the app onto my android Galaxy s6 but when I look at the graph it doesn't show the green area indicated the levels I want to stay between. I tried searching the forum for an answer but couldn't find anything so sorry if this has been asked before but have I done something wrong? I have set my high and low but there is no green guide line. :confused: