When I used other home replacements in the past, hitting the home button would bring up a dialog asking which home I wanted to use. Then you'd check "set as default", and pick the one you want. I'm not sure if Panda is the same way though. I haven't used it before.
If you're using something other then the stock home now, you need to go into manage apps, find the home you're using then select clear defaults. The next time you hit the home button it should ask you which one you want to use, tick the default box at the bottom of the prompt then select your new home choice.