[ubuntu] Screen resolution

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http://ubuntuforums.org – Hi, I have installed ubuntu 12.04 lts. I seem to have an issue with the screen resolution, in that it is too big, resulting in me not being able to see the login. I have googled this and seen solutions however as I am not technically minding I don't quite understand what to do. The instructions have been in computer commands. Just to add though I could not see all the login I was able to see enough to know I had to input my login details, however this morning as soon as I press the login it logs in to guest. ( Hope that makes sense) Anyhow I have a RADEON X600/X550 series. It is setup to dua (Hardware)