You don't need any special software , use paint that will already be on your pc.
Press the print screen key next to f12 then open paint , click paste tab and you will see what print screen captured , note , look at bottom and side of the capture you can scroll it.
If you want to print just a portion of the screen open snip tool over the top of paint image.
I got them,thank you so much.If those don't work out for you then you might want to consider a plug-in / add-on for your browser. The page below mentions a few.