MyPoint PowerPoint Remote - Getting started:
Activation of MyPoint Features

If you own multiple iOS devices (iPhones/iPods/iPads) on the same iTunes account you have to activate the features on each device, but you will only be charged for the first activation of the feature (via In-App purchase).
Launch MyPoint and tap on the info icon on the lower right corner on the initial screen
Select the feature that you want to activate:

Marker includes both Pen and Pointer.

Timer will show elapsed and remaining time and 2 progress bars (planned vs. actual duration).
Confirm that you want to activate the Feature
Confirm the In-App purchase (the processing from this point on is handled by Apple; language, price and currency may vary):

If you have already purchased the feature you will not be charged twice.
An additional dialog might ask for your iTunes username and/or password.

If you already purchased the feature before the following dialog will be displayed:

Otherwise you will get a purchase confirmation dialog.