Elements requires a serial number to activate it.
The redemption code on the box insert goes into a website at Adobe that is also given on that same insert, and will give you your serial number, assuming your box’s barcode was scanned at the retail store where you bought it.
Also, Photoshop Elements is not part of the Cloud
Photoshop Elements Forum http://forums.adobe.com/community/photoshop_elements
Select a topic, then click I STILL NEED HELP to activate Photoshop Elements chat