Two ways that I do this are..
Long press the image, then "save image" the image will be then downloaded to the "download" folder... which you can access with the gallery and edit using ps touch, or using ps touch > import > local photos > download > your.jpg
Hold your spen button, circle the image you want, release button and then tap image when it appears once.... the image will then disappear and be saved to "screenshots" folder. Use the same import options as above.