By default, Coda's editor tries to reduce your time spent typing by offering various text completion options to you as you work. These options are context-sensitive, based on your current syntax mode, the text of the document, and the position of your cursor.
For example, in the PHP syntax mode, if you type the word "print", Coda will present a balloon offering possible completions, such as "printf()" or "print_r()"
If you just meant to type "print", simply ignore Coda and keep typing.
To use one of the offered completion options:
Press the up or down arrow keys to select an option
Press return to accept it
To dismiss an unwanted completion balloon:
Press ESC
To change the behavior of autocompletion:
Choose Coda > Preferences...
Click Editor
Choose one of the following options from the Code Completion popup:
Automatic: The default behavior. Coda will always offer possible completions.
After a delay: The default behavior, but with a slight delay. You'll only see the completion balloon when you pause typing.
F5 or Esc: Relevant completions will be offered if you press the F5 or Esc key, but not automatically.
Off: Completions will not be offered.