I offered this mini-tutorial in another board - you don't need much technical ability.
log in/register with a site like postimg.org which hosts images that you will upload to it.
download a screen-capture program (Bandicam is very popular) to your device
Run bandicam, and use the camera icon to capture an image to a folder on your device
upload the image to postimg.org, and copy it
post it to a CamCaps reply box using the 'insert other media' tab
post your reply.
Practice - if I can do it, anyone can Just trying to help