Hi snail,
For a PSoC3 (CY8C3xxx) or PSoC5 (CY8C5xxx) you have to use PSoC Creator:
http://www.cypress.com/?id=2494
PSoC Designer only supports PSoC1 (CY8C2xxxx).
Regards,
Rolf
Once you have donwloaded and installed PSoC Creator, you can find many useful collateral like Example projects, Application notes, KB articles videos etc in the below link.
http://www.cypress.com/?app=forum&id=2232&rID=43749
And this Getting Started video may also help.
Best Regards,
Ganesh