I can think of 3 ways to do this, all would start with a regular flat rectangle filled with text so you should step back from where you are now and reset the text frame to a standard, unskewed rectangle.
1. Try the shear tool. It's tucked away under the scale tool. It's a bit unwieldy, but the most direct approach.
2. Use the Effects>3D>Rotate command to move your flat box into 3D space.
3. Use the Perspective grid, adjust the grid to match your photo and drag your text frame onto the appropriate perspective grid.
It will probably take a bit of reading up on these tools and a lot of trial and error if you've never used them before, but it can be done.
Hope that helps, good luck.
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