How do I get the search function to work at the ap store?

I Have an iPhone 5 using version 9.1 The capacittry is 55.6 GB. I HAVE 38 GB AVAILABLE.

WHEN I USE THE APP STORE ICON, I REACH A START PAGE THAT ONLY PERMITS ME TO USE THE UPDATE BUTTON.

ALL OTHER FUNCTIONS APPEA AS SOLID WHITE SCREENS.

I TRIED TO DO A HARD RESET TO FIX THE PROBLEM BUT IT HAS NO EFFECT..