I'm not sure if someone told you how to do it yet in a message yet but the way I do it is by posting a picture on photo bucket, from there I pull the tag and paste it into the forum Whoops, Well I just returned and noticed that you have in fact figured it out. alright, awesome!
Not that I'm interested, but do your Pokemon Y or your 3DS XL come with their cases, or did you throw them away? Especially concerning the game, that's important.