new to Fantasy Basketball and have some questions

Hey everyone

I joined Yahoo NBA Fantasy yesterday and got my drafted guys. Here's my roster


PG D. Wade (Mia - PG,SG)
SG B. Gordon (Chi - PG,SG)
G D. Williams (Uta - PG,SG)
SF K. Van Horn (Dal - SF)
PF U. Haslem (Mia - PF)
F J. Posey (Mia - SG,SF)
C E. Okafor (Cha - PF,C)
C --empty--
Util C. Duhon (Chi - PG)
Util --empty--
BN K. Martin (Den - PF)
BN M. Bibby (Sac - PG)
BN A. Bogut (Mil - C)
BN R. McCants (Min - PG,SG)
BN D. Wesley (Hou - SG)

And you can edit your roster for every day and not just the week right?