You get them when you first sign on. First time I logged in I had 3 tokens, 1 from CoD4, MW2, and Black Ops. You only get em once though.
its probably glitched. because i remember when my friend got mw3, he only had 3 tokens instead of 4. mw3 didnt recognize his BO prestige and left it blank. a few days later he got the token. hes a 15 prestige in BO
well he said no pc support, assuming he is false: you need to get on MW2 and BLOPS and play at least one game so they register.
I don't blame them for not supporting PC. It's as simple as moving a 20 killabyte file to a folder and you're max prestige and max level.
patch 1.06 out, they didnt patch S***! the FMG9 still kills me in 0.0544 seconds, i swear that a guy killed me with the AKIMBO FMG9 from about 10 meters away WITHOUT STEADY AIM! robert bowling or whoever designed this game), i swear
1.06 didn't patch the FMG9 or Type 95 yet. I still get nearly one shotted by the T95. It's supposed to be in the next upcoming patches. http://mp1st.com/2011/12/05/modern-warfare-3-patch-1-06-announced-all-patch-notes-so-far-and-more/