The instant trendlines feature is available to Bronze, Silver, Gold, and Diamond users. You can upgrade your membership to get immediate access by clicking here.
Here’s the new checkbox:
If you select this, charts will AUTOMATICALLY display upper and lower trendlines for every chart you load. These are “instant” are but not retained unless you explicitly ask. When you zoom in to the chart, there are new instant trendlines created based on whatever subset of data you are viewing! SlopeCharts ROCKS!
Here’s a video showing a user scrolling through some charts. Note how the trendlines are automatic, and if you right-click on one of them, you can permanently save that line (or both of them).