This really shouldn't be this hard, but to find an existing coach from a team you have to:
# Click on the league you want (e.g., 2008 Fall Rec)
# On the Quick Clicks in the top left of the screen, look for Find Participant
# Click on Coache and type in the last name
# You will see all the teams that person has ever coached.
# Click on the last season and you will see the coaches form
# In the middle of the coaches page there is a hot link under _Current Team Assignment_ which points to the team page
# Click on the team page to see who they coach
If you want to remove a coach, choose from Quick Clicks, assign coach
# From there, you can see on the left coaches current assigned.
# to remove the coach, select his name and then click the right arrow to move him to available