I'd just stick to PhotoReading it daily for a month or more and play. On your own you might think of a word and see if you can use it in a sentence and explain the definition. If you have a friend they can open it at random and ask you to spell it use it in a sentence and see how well you can define it.
You can notice words as you read or search the web. See if you can define the word. You have to challenge yourself to remember to do it. Having a random timer with a message to yourself can be used as an aid.
to do the above (remind yourself of something) you can use a motivaidor, silent alarm (both these will vibrate. Or hunt for software. The motivator software can be set to pop up at random with a message. Boss is also useful. Boss is a tool that reminds you to move and stretch at certain intervals. You can also use that as a reminder to look for the odd word to define on that page. A mobile phone often has the alarm feature.
The above reminder tools including count down timers are good tools to use with PhotoReading. To get into the habit of knowing how much time you are spending on your reading and to start controlling that time.
AlexK