Yes you did create a join password.
http://www.teamwarfare.com/viewteam.asp?team=1stSSF+Devils+Brigade
Click that link, you'll see your team and the one Ladder you have joined. Others that look will see the same thing, but a "JOIN" button on the bottom of the roster list. You can edit your teams information by clicking the "Edit Team Information" button which is right next to the "Join New Competition" button. Inside the Edit Team Information area you can see the password you created and that they must have in order to join.
They will also need their BC2 GUID in their profile before the system will allow them to join (Anti Smurf Identifier). You need to add that to your profile as well.
http://www.teamwarfare.com/forums/showthread.asp?forumid=677&threadid=454058 - tells you how to get your GUID.
To add that GUID to your profile, simply open your account maintenance area and it should be fairly straight forward how to do it. To get there, hover the mouse over your name in the top of any TWL page and go down to Acct Maint and Edit Profile.