Primary Shortcuts - cant seem to edit them. Any ideas?

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http://forums.androidcentral.com – Well I am a first time android user having bought an S4 yesterday. The move from Apple hasnt been too frustrating in terms of set up and getting used to the phone. Am now (2 days in) starting to really enjoy the Android and Samsung experience!!:) Question though if I may gang, I have spent hours on the net looking for information on how to move/edit the 4 primary shortcuts at the bottom of the homescreens (ie the Phone Icon, Contacts Icon, Messaging Icon and Internet Icon.) Long story short I have found some information on the net, and I have downloaded Samsung manual for help, but there (HowTos)