To access your Tasks list, go to the Menu and tap Tasks.

Tasks list on iPad
If you have more than one account configured, and you want to
display the tasks associated with another account, see Switch between configured servers/user accounts.
To open a task, tap on it in the list. The task is displayed
in the right pane.
Tap
to display
task information:

Task information
Tapping the underlined “From” name on the Task Info screen displays
a pop-up window containing contact information for that person.
You can tap the email address to create a email message.
Tap
to
display any instructions provided with the task.
When you have finished reviewing and entering any necessary information,
tap Complete Task and select an action.