If you know restart the sugar-emulator the activity will be available. You can favorite it in the activity-list view in the Home view.
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So the first fun thing to do is to change the HelloWorld Activity to welcome yourself. Just change the activity.py file in the Activity folder with your favorite editor and restart the Activity. You do not need to restart the emulator for that.
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If you made it that far yo have been made a big step to become an Activity developer using the tools available in Fedora 17. I hope you enjoyed it.