Most of the map editing is done by mouse in combination with the shift- and control-keys. Here is a list of what you can do:

Room Editing:
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* Add a new "normal" room:
  left-click where you want it to be

* Add a new virtual room:
  move the mouse to where you want the room, then press <V>

* Delete a room:
  move the mouse over it, then press <Del>
  note that you can't delete a room while it's selected

* Move a room:
  left-drag it to the new position

* Move a set of rooms:
  ctrl-left-drag one of the rooms to its new position
  if the room dragged is marked, the this will move all marked rooms, else all rooms linked to the dragged room
  all rooms will be moved in the same direction as the dragged room, provided there is space for them; if there is not, nothing will happen at all

* Select a room:
  right-click on it
  
* Unselect a room:
  right-click on the selected room or any empty room field

* Mark/Unmark a room:
  shift-left-click on it

* Mark a set of rooms:
  shift-left-drag over the rooms you want to mark; all rooms in the rectangle defined by the drag will be marked

Link Editing:
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* Link two rooms:
  right-drag one room on the other
  the program will automatically chose the exits for the link

* Link several rooms in a straight line:
  right-drag the first room in the line on the last room
  the option "link mean rooms" must be enabled

All of the following link editing can only be done with links of the currently selected room

* Delete a link:
  move the mouse over the corresponding exit, then press <Del>

* Swap two exits:
  left-drag one exit on the other

* block/unblock exit:
  left-click on it
  the exit must be linked before it can be blocked

Description Editing:
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* Edit map description:
  press <Enter> or click the description editor while no room is selected

* Edit room description:
  press <Enter> or click the description editor while the room is selected

* Copy Room descrition:
  ctrl-right-click on the room you want to copy the description to
  this will copy the description of the currently selected room
  if no room is selected, nothing will happen