If you don't have a program for speech to text (e.g. Dragon products are compatible with BestNotes), use your mobile device dictation software (Google Talk or iOS Dictation). Look for the Microphone icon.
Android (e.g. Swipe & Samsung):
Save to a plain note, then copy the text to other parts of BestNotes (for more information on safely copying text with BestNtoes, click HERE).