When you have no further use for a character, either because the player or character is gone, it is customary to delete it from the ship. Just removing a character from the roster does not take it off the ship. If the player has left the ship, but the character is just off the roster, it creates inaccurate information in the player's posting record. So be sure to actually delete the character from the ship database.
Note: Only the CO and XO should delete characters belonging to a player. The GM has jurisdiction only over the characters he created for his sim.
Always go to the main Admin menu before deleting another character. After a deleting a character, the drop down charcter list order can change, which will not be seen if you just clicked the back button to get to the previous page.
Now, onto the last three things on your menu: the topic managing facilities.