What you want to do is fairly easy, though requires a fair amount of steps.
First, you must Boot your device into recovery mode:
Booting into Recovery Mode
To flash a device with a webOS Doctor or to run the activation-bypass tool, you must first boot the device into recovery mode by performing the following steps:
Plug the USB cable into your computer. Do not connect the other end to your device yet.
Remove the battery from the device.
Hold down the device's volume up button.
Insert the USB cable into the device.
Re-insert the battery.
Release the volume up button.
The device will boot into recovery mode, and you will see the USB logo on the device's screen. At this point, you may run either the webOS Doctor (to flash your device with the latest version of webOS) or the activation-bypass tool (to enable your unactivated device for development).
Second- After you have completed this, you must download and run the Activation Bypass Tool- (this will get you past the Palm Profile Login Screen. You must also have java installed for this tool to work) Found Here:
After running the tool, (should take about 2 minutes), the device should go to the normal screen.
Once that is done, you will need to download the 'Show first use app' and the 'Enable Profile Creation- Activation Bypassed' patches from preware. This will allow you to download free apps from the app catalog. (You must first run first use and make a profile though)