Halo 4 map packs

Games Other Halo
1

Hi,

I have purchased a map pack for infinity in halo 4. How exactly do I access these new maps?

Cheers,

Alex

2

I haven’t played halo 4 for a while, but I remember that there were these (Carmesi, Castle, majestic) playlists and I really don’t know if they are still there.