F18 not using my disk partitions

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http://forums.fedoraforum.org – I'm attempting to install Fedora 18 and either have a major problem understanding disk partitoning or have a problem. I used to use Redhat Linux until around Version 3.something and moved to Mandrake/Mandriva and I've done a fair few installs of Linux over the last 17 years! After getting some problems with Mandriva I thought I'd try Fedora. (Don't like Ubuntu). As I've already got my partitions on the disk already done (from my last install) I thought it would be easy. But I can't get my head around what I should be doing. I tried to select the various partitions to install but from w (HowTos)