check family settings
you cant
you cant play as a grunt
you cant its impossible
Go to your friends house, they most likely have a copy of halo you can play (:
You cant change your user-name on secret-builders because your friends list would disappear and you cant play again.
no you cant
no, it has to be either halo 3 or halo odst and reach might, i dont know but halo 1 cant
you cant unless you have mods
Defiant Map Pack
well if they won't let you then either deal with it or sneak it at a friends house (ps this choice risky)
you cant you can only play as arbiter or master chief
i cant play on last resort just like you but diffrent map i dont know