Hi Telvia.
It sounds like you may have a setting which needs changing.
Please launch ActivInspire, and click on File>settings.
Under Dual Mode ActivBoard, please change "Touch input handling" from "Treat As Select Tool" to "Touch and ActivPen".
Please then press "Done". Please then re-select your pen/highlighter and try and use this. Does this now work?
If you are still experiencing issues, I have created a technical support case reference number should you wish to contact us directly. Please quote 00419643.
I hope this information helps!
Adam
Promethean Technical Support