How to put pics on my iPhone 4?

I can put my pictures from their folders to my desktop but it won't let me put them back on? I work with photoshop and my iPhone is my only picture dump.

I have an iPhone 5 and when I connect (sync) my iPhone to my MacBook Pro the iPhoto program launches and asks if I would like to import (download) the photos to my Mac.

Then I can import to the Mac and either save the copy on my phone or delete them.

I will post a link below from Apple on 'How to Import Photos back to a device' from a computer.

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