On Mac:

• Click "Calendar" button on the toolbar and in the window that appears select "To Do" bookmark to view all tasks
• Or select a contact and click "To Do" bookmark in the bottom of the Info panel to view tasks assigned to the contact

 On iPhone or iPad:

• Go to the contact list
• Tap on a "Calendar " icon in the bottom of toolbar and tap "To Do" bookmark to view all tasks
• Or select a contact and tap on a "To Do" bookmark in the bottom ( in the Detailed Info panel for iPad) to view tasks assigned to the contact

 On Mac:

• Open To Do list
• Click "+" button to create a new task
• Type the task name
• Press Enter on the keyboard to save changes

 On iPhone or iPad:

• Open To Do list
• Tap "+" button in the bottom of the screen
• Type the task name
• Tap "Back" on the keyboard to save changes

• Open To Do list
• Tap/click on "To Do" or "Done" bookmarks at the top of the To Do list

 On Mac:

• Open To Do list
• Activate checkbox near the preferred task name

 On iPhone or iPad:

• Open To Do list
• Swipe right on a preferred task
• Tap on a "Check" button

  On Mac:

• Open To Do list
• Click "Done" bookmark at the top of To Do list
• Uncheck a checkbox near the preferred task name

  On iPhone or iPad:

• Open To Do list
• Tap on a "Done" bookmark
• Swipe right on a preferred task
• Tap on a "Clock" button

 On Mac:

• Open To Do list
• Double-click on a preferred task
• In the window that appears change the necessary info.  In more details please read "How to edit event / task"
• Click "Done" button to save changes

 On iPhone or iPad:

• Open To Do list
• Tap on a preferred task
• Change the necessary info.  In more details please read "How to edit event / task"
• Tap "Back" to save changes

 On Mac:

• Open To Do list
• Drag and drop a prefered task to desired position

 On iPhone or iPad:

• Open To Do list
• Tap and hold the reorder control on the right of the task name
• Move task up or down to reorder

 On Mac:

• Open To Do list
• Click on a preferred task to select it
• Press "Delete" button on the keyboard
• Confirm the action

 On iPhone or iPad:

• Open To Do list
• Swipe left on a preferred task
• Tap "Trash" button that appears