Dial up setup problems

Hi all,
I am setting up the dial up to my ISP and have encountered the following problem. The ISP server prompts for "Username:" rather than "username:" as required according to the online docs.
The same with the password prompt. The system prompts for "Password:"
rather than "password:"
After this the system automatically enters PPP mode.

Would changing the capital "U" and "P" to lowercase in the Tivo prompts be a problem, and which file contains the script on the tivo that I can edit to get around the problem?
Regards
George.