Modify Google Search Engine on Opera Mini 5

I noticed that the default Google Search Engine (on the top right corner of opera mini) is in chinese.
I tried to modify it with no succes.....

I clicked on "google", then on the down arrow and i scrolled down until i saw "Manage search engine". Then i clicked on google search engine but, unfortunately, i could not change the link in Google because the link was disabled (in grey).

Anyone knows if is there any other way to edit that value??

Thanks!

Maybe copy the hole "opera mini 5" folder to you pc and open the config with editor. Then try to edit it.
greetz