I am on the 28014 Standard ROM (Dec 17 - Manila 2.1)

On the Internet Tab, how can I change the default 'Opera' link to open Opera 10 Beta 2. I have tried uninstalling Opera 9.7 which the ROM came with, and then installing Opera 10 Beta 2, but it doesn't work, when you click the link, ut just gives an error message about 'OperaL'.
Thanks for your help!