Install from your admin page OR follow steps 2 through 6.
Download the zip file for the plugin.
Unzip it to your local machine.
Upload the diyc-image-editor directory to your plugins. Note: If you use the Windows zip extract tool you will end-up with a double directory 'diyc-image-editor\diyc-image-editor'. If this is the case then you need to upload the lower of the two directories.
Activate the plugin through the 'Plugins' menu in WordPress