good grief! Please do a search before asking these questions, I can't count how many people have asked the same question.
goto your fm database folder, usually
C
Program Files\Sports Interactive\Football Manager 2006\data\db
open the harcester.edt file
quote:
# Harchester can only play in friendlies and contains virtual players
"FAKE_TEAM" "151988"
# Swap Harchester with a Premiership team (currently Wigan (ID 737)
#"SWAP_TEAMS" "151988" "737"
Ok, put a # in front of "FAKE_TEAM" and take away the # from swap teams, so it becomes
quote:
# Harchester can only play in friendlies and contains virtual players
#"FAKE_TEAM" "151988"
# Swap Harchester with a Premiership team (currently Wigan (ID 737)
"SWAP_TEAMS" "151988" "737"
save, and start a new game.