Touch the Tools icon at the upper right and touch Find & Replace:
To find a word, type it into the first field at the top of the screen and touch the right-pointing arrow at the far right to find the next occurance:
To replace a word, type it into the first field at the top of the screen and type its replacement in the next field. Touch the right-pointing arrow at the far right to find and replace the next occurance and if you want to replace it, touch Replace:
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