I use a program called snagit, any type of screen capture you want to use. Many images you can just right click on the image and click save as - in stockcharts.comyou dont' need any software you can just right click on the image and click save as then give it a name. For images you cant do that use a screen capture - Windows has this built in by default it's called Snipping Tool - type that into your windows search and it pulls up - best to save the images as .png files

since you asked about Stockcharts, as I said above you don't need any screen capture software, just right click on the image and save as. then simply drag image into the post