Okay, so, swipe down at the top of the phone to get to the menu where you would turn on the flashlight. There might be a thing that looks like parentheses and a brush, and it should say Capture+. If it is there, go ahead and hold it down, and once a little pink drop down appears with the image, click the checkmark in the top left, and you have a screenshot!
If not, try to find anything else that can screenshot. You can also make a video.
To share it, upload it to Google Drive and share it here via Google Drive.