crossties

I have to use the tablet for emails on a regular basis. I am not the best tablet typis, and need to use the backspace button to correct my typing. Periodically, I will lose everything I have been typing because I will touch the backspace button two or three times in a row, and it will navigate me to the previous page. As it is, using my tablet to type takes three times longer than a real keyboard, but losing all that time and work to a backspace button is driving me crazy. So far I have this problem on yahoo mail and yahoo searches. I have to use that mail for work, so, no, I can't simply change my email provider.

Is there some kind of key code I could disable that would be turning my backspace button into a navigation button?