1) The script should be written in spoken English- it is more natural than written English, which is usually more formal. The talent should read the script aloud and ensure that the text reads comfortably for them- which is particularly important if the talent did not write the script.
2) Practice reading the script from the teleprompter- this will allow the user to become more comfortable with the format and the teleprompter operator will get a sense of the readers pace.
3) Communicate how you read to the teleprompter operator- Where do you like your eye-line? The top, middle or bottom of the screen. the operator will follow your pace.
4) When using camera mounted teleprompters, visualize a person you are speaking to in the teleprompter as you read. If you can read with your eyes focused at infinity, you will appear to be looking at every person watching the performance.
5) When using podium mounted teleprompters, or "paddles", pick the ending of a sentence or clause to slowly move your head from one screen to the other, addressing both sides of the audience or room.
6) Ad-Libbing- most people change their intonation and cadence when they ad lib from a teleprompter. If you want to ad lib, let the teleprompter operator know during rehearsal so that the operator will know where and when to pick up prompting again. If needed the teleprompter operator can add the material into the script. The operator will wait for you to return to the scripted speech. This is essential if AV techs are depending on word cues for slides or videos.
Above all, the purpose of a teleprompter is to make you more comfortable and relaxed, and assist you in giving the best possible performance.