HTC One Remix - Manual (Page 70)

2. Tap Keyboard selection > Bilingual prediction, and then choose the
language you want.
Adding words and phrases to the word prediction dictionary
Add frequently-used names, acronyms, and even phrases to the word
prediction dictionary to easily find them in the suggestion list.
Type even faster when you create text shortcuts to words and phrases.
Instead of typing "Talk to you later", save a few keystrokes by adding
the ttyl shortcut. In your message or email, just type "ttyl", and then tap
the spacebar to enter the complete phrase.
1. Go to Settings, and then tap Language & keyboard > HTC Sense
Input.
2. Tap Personal dictionary > .
3. Enter a word or phrase, and then enter its text shortcut. Be sure to
remember this shortcut, including the uppercase and lowercase
letters you've typed.
4. Tap OK.
While you're entering text using the Standard keyboard layout,
tapping a suggested word that’s not in the dictionary (usually the
first word shown in the suggestion list) automatically stores it.
Editing or deleting words and phrases in the word prediction dictionary
1. Go to Settings, and then tap Language & keyboard > HTC Sense
Input.
70 Your first week with your new phone