To mark a task as completed in Remember the Milk:

  • Click the center of the task or (if selecting multiple tasks).
  • Press C or click (top menu).

Clean Up Your Lists

If you mark tasks as completed instead of deleting them, periodically archive or delete old tasks to keep your lists trim.

To delete a task instead, press Del (Fn+Delete on a Mac).

If you mark a task as completed, Remember the Milk will archive them for you “forever” (according to their site).