new user pre-D
 

Not sure what the red, blue and purple lines mean

Welcome to the Forum! :)

The GB App Graph Information is:

Red Line - Highest Reading - Of the Day
Purple Line - Calculated Average - Of all data input during the Day
Blue Line - Lowest Reading - Of the Day

Read through the first three threads in the Type 2 Section, when you get a chance, if you have not already done so. These threads will most-likely help you a lot. Self education is one of the keys to successful management of your diabetes, along with a healthy / sensible diet and exercise. Basically, diabetes requires a life-style change for the better. Good luck with your control and management.