Going by the previous customer service, I doubt the Manager will be available.
When you say .. 'memory app' .. what does this app do ?
As a rule the apps you use most often are usually stored on the home page and any that can't be stored there because of lack of space are usually on the next page.
On the home page try swiping to the left and have a look on the next page to see if your memory app has been moved there by mistake.
If it has, then it is just a case of pressing and holding the app and sliding it back onto your home page.