How to install Fedora 18 (actual) from 13

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http://forums.fedoraforum.org – I have Fedora 13 and although it doesn't update, it still works very good for almost everything, but some programmes have to update... I have looked a little at the Fedora web and it seems that I cannot download a normal set of DVDs with an image to install Fedora 18 in the deleted hard disk of the computer. What do I have to do exactly? (HowTos)