ok for those who can publish, but can't get the box that says send to game, to highlight, you need to follow these steps even if you already did it:
Go to armyoftwo.com
at the top right it says Welcome Username
Click that and a pull down menu will come up
Click Change Persona
I had already linked my gamertag previously, but i had to do it again for my stats and gamertag to actually register on the website. Do this and you shouldn't have any problems.