Rohan creates a folder called \RohanScreenShot in your "Documents" folder when you take your first screen shot (PrtScr key) while game has window input focus (clicking your game window to bring it to the front). You find your screenshots there.
You can also use a free utility I like called "LightShot" (
https://app.prntscr.com/en/ and no I don't have shares in the company - i jsut really like it ) which can take a screen capture and host it for you -- saves manually uploading to a picture host. I like that one because it lets you select just the bits you want to share - not the whole game screen. Also you can mark up the image to bring attention to the bits you want.
To use that simply hit PrtScr key when the Rohan game does NOT have input focus (click the desktop background). What you get when this creates your screen shots is a link to a hosted image
web page not the image itself. You have to open that web page and copy the URL to the image location too paste it into your ticket.
Here's an example of one of these:
http://i.imgur.com/strSkAC.png
TIP: If you use your Rohan client to take screen shots, set it to output then a "JPG" files rather than "BMP files. JPG files are a LOT smaller!!