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Search for the app in the App Store, but be sure to look for iPhone only as pictured here.
Now that you have the app, open the .pptx file from your email.
It will look like this after downloading.
By clicking the button at the top right, you reveal apps on your iPad that can open the file. Choose Microsoft Office Mobile.
Choose the square with the pencil (top right) to start editing.
Edit Slide Text will allow you to start typing.
Edit box by box. When you are done, click the icon that looks like a piece of paper. That will reveal share options, including e-mail.