Hi,
Please make sure that you see the "enter text" icon(looks like a check mark) on the left-side of the toolbar on top of the page when you hit backspace. If you see the check mark and pressing backspace still takes you to the previos page, please let me know what version of labVIEW you are using. Also, the version of Internet explorer would be helpful.
Regards,
Ankita A.
National Instruments