I'm a first time user, and I literally just downloaded an burned it to disk about an hour ago. So I put the disk in an chose the install option. Now after reading the install instruction on the website it said I should get the option to install along side my current OS, but its only giving me two options. First option to replace my current OS or the something else option. As stated I am a first time user an don't want to replace my current OS but I don't know enough about Ubuntu to install by the something else option. Can someone please help walk me through the steps to install Ubuntu along side my current OS.
Please and thank you very much for you help an support.

