The League rules for roster movement are as follows:
1. If someone is hurt you can replace them with another non-rostered player before Week 6 for 12-week sessions or Week 8 for 15-week sessions.
2. If your roster is not at 15, (excluding goalie), you can add until it hits 15 as along as all additions are completed and the team is paid in full before the start of week 7 for 12-week sessions (week 9 for 15-week sessions).
3. If someone, initially rostered, does not pay or show and they are removed from the roster, you can add a player to fill his spot.
4. Any change made to a roster must be "claimed" to the league at least 48 hours before the game starts. This allows ample time for the league to notify everyone. This includes goalies.