Editing an already existing level

Aside from directly editing a level's properties, to further edit a level, you might need to use the Editor class:

Level level = database.UserLevels[0];
Editor editor = new Editor(level);

The database also contains some functions for that case:

// This will open the level at index 0 for editing and create an Editor instance out of the returned level
Editor editor = new Editor(database.OpenLevelForEditing(0));
// This will open the first level named "Unnamed 0" for editing and create an Editor instance out of the returned level
Editor editor0 = new Editor(database.OpenLevelForEditing("Unnamed 0"));