New User, a few questions

Hi, I am coming back to Magic after being 15 years absent and am a new Forge user. Is it possible for me to edited the pre constructed decks in Forge (some of them do not have 60 cards like "Heavy Hitters")
Also, is there a directory of servers or players to find opponents for multiplayer games?
If not, what is the easiest way to find opponents who use Forge?
Thanks,
PurpleSweetTart
Also, is there a directory of servers or players to find opponents for multiplayer games?
If not, what is the easiest way to find opponents who use Forge?
Thanks,
PurpleSweetTart