To post a screenshot:
-- Press Ctrl and then Prt Scr on your keyboard at the same time.
-- Open a program such as Paint and right click and Paste or click on Edit from the top menu and then Paste.
-- Save the file.
-- Use a free image hosting service to host the image and upload it to their site.
-- When posting here, click on "image" the graphic of a picture in the bar above when posting and insert the link of the image you were given when uploading it to the site you are hosting it on.
Hope this helps!