HTC One M8 for Windows - Manual (Page 55)

2. Swipe left and right word suggestions to see all of the suggestions.
3. Tap a word to enter it.
§ Auto-correct suggestions are highlighted in bold. Tap the space
key to accept the auto-correct suggestion.
§ You can change any word you've entered by tapping it and
selecting another word from the word suggestions.
§ To add a new word to the Word Flow dictionary, tap the word
and then tap word suggestion with the "+" sign next to it.
Shape Writing
Tired of hunt-and-peck typing? Glide your finger across keys to write
words instead.
1. Make sure you're using the Word Flow keyboard and not a third
party keyboard.
2. Touch the first letter in the word you want to write.
3. Glide your finger across the keyboard to consecutive letters in the
word you want to write.
4. Release your finger when you've finished writing the word.
The word you wrote will appear on the screen. And you can start Shape
Writing the next word without needing to tap the space key.
Your first week with your new phone 55