Hi Eduardo,
Boards and new devices are added to KDS with the Kinetis SDK.
So download the K22F Kinetis SDK (SDK V1.0.0) from www.freescale.com/ksdk, then install it.
Use in KDS the menu Help > Install New software and use the zip file from
C:\Freescale\KSDK_1.0.0\tools\eclipse_update
I hope this helps,
Erich