Place the plug-in into the Photoshop plug-in folder that is created when you install photoshop ( don't forget there are different plug-in folders, so choose the correct one ). Alternatively you can...
you probably mean plug-ins?As you install any software,if you mean actions then copy and paste in C:\Program Files\Adobe\Adobe Photoshop CS4\Presets\Actions
You can double click on image in Bridge and it will open in camera raw plugin,there you can work with picture or just save it in other format,press open image and it will open in Photoshop then go to...