ZTE

I HAVE A ZTE LG PHONE. I HAVE SOME APPS ON THE PHONE. ANYWAYS I'M TRYING TO PUT IN A CODE FOR VIRTUAL FAMILIES TWO. WHEN THE KEYPAD POPS UP. IT WON'T LET ME CHANGE IT TO NUMBERS. TODAY IT WILL ONLY LET ME TYPE IN THREE LETTERS. THE APP COMPANY SAID I SHOULD TAKE THE PHONE TO GET IT CHECKED. HOW EVER THE KEYBOARD POP UP FOR EMAIL AND THE WEB. BUT IT WON'T WORK FOR THIS ONE APP. CAN ANYONE HELP ME TO FIX IT?