Night Actions, or Night Choices, are the role-related actions that players must send in and mods must accept. These range from Cops deciding who to investigate, to the Mafia deciding who they will send to kill whom, to X-Shot Commuters deciding whether they wish to use their action at all.
These actions are usually sent to the moderator via PM. Some, but not all, moderators will allow scum to submit their actions in their private topic - when in doubt, do not forget to PM the moderator.
When many Night Actions are in play at once, the order in which they are resolved (that is, the order in which the actions take place) becomes important. The standard procedure for action resolution is Natural Action Resolution.