The correct phrase would be "quiero decir que te extraño".
Here's a breakdown:
* quiero decir - means "I want to say" or "I mean"
* que - means "that"
* te extraño - means "I miss you"
Therefore, the corrected phrase "quiero decir que te extraño" translates to "I want to say that I miss you" or "I mean that I miss you".
It's a common phrase used to express feelings of longing and absence towards someone.