Click once on the item that has the icon you want to use. Hold down command and press the letter i. This brings up the info window. In the info window, click once on the picture of the icon in the upper left hand corner. Then go to edit>copy Click once on the item that you want to replace the icon of. Hold down command and press the letter i. In the info window, click once on the picture of the icon in the upper left hand corner. Then go to edit>paste
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To move applications around on your dock, drag them until they sit where you want them. To remove an application, drag it off of the dock and *poof* in a little puff of smoke it's gone (clever apple.) Or, you can rightclick/control+click and Options->Remove from dock on the one you want. To add to the dock, find an application you want in you applications folder (or anywhere else) and drag it into the space in the dock where you want it.
Blah blah blah. Easy answer: just drag.
In general, unless you know what your doing, you can only change one icon from another icon picture. Say you want to change the blank folder into the picture of the icon from the application that's in it. Right click (Option Click) the icon you want the other icon to look like, then select Get Info...,then select the upper left icon to highlight it, (one click) then in the upper Apple menu select Edit/ Copy.
Then on the icon you want to change do the same, Right Click/ Get Info..., select the icon picture, then Edit then Paste.
If you mess you can go back to the stock/original icon picture by just selecting the icon picture in the Get Info... window and hitting the delete key.