There are three ways to complete tasks. To complete a task by swiping (the fastest method):

1. On your task list, swipe from left to right on the task that you wish to complete.

To complete an individual task from the task details screen:

1. On your task list, tap on the task you wish to complete to view its details.
2. Tap the Complete icon in the upper right.

To complete multiple tasks at once from the task list screen:

1. On your task list, tap Edit to enter the editing mode.
2. Tap to select the task(s) you wish to complete.
3. Tap the Complete icon in the upper right.