Internet Setting for SAMSUNG CORBY POP

Hello,

Im having real difficulty accessing the internet through my samsung corby Pop or C3510...
My friend has put Opera mini in my phone but its not working because he said there's a different setting for gprs,i dont know what he meant by that. I really dont know much about these things(installing and stuff) because its my first time to use an extraordinary phone so any help/suggestions would be appreciated. Thanks a lot!