Are you asking me to select a tile on a Windows phone or right click without a mouse on the Start Screen of a touch screen tablet or a computer?
Let me assume that this is a slate tablet question - How do you right click on a tile on a slate tablet.
I would say, "Put your finger on the tile and keep it there for 2-3 seconds. Drag the tile down a couple of millimeters. Let go. Do you see the check mark on the tile? You just right clicked it with your finger."
If the user asked how to right click on the slate desktop. I would say, "Put your finger on a blank area of the desktop screen and keep it there for 2-3 seconds. Now let go. Do you see the right click desktop menu? You just right clicked it with your finger."
I am not familiar with Windows Phone but it probably works the same way - "Put you finger on the tile..."
If they need more information - like a demo, I would say go to the Start Screen and type "Help" select the Help icon and type "touch" in the search box. Choose the link "Touch: swipe, tap and beyond." Read the second item "Press and hold".
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