You do not have to pay for the app again if you've already paid for it once, even if you already deleted it.
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If you can't pay for the app, you can't buy it.
on the launch page click forceupdate. this will reset the game. this will not deleat your saves. if you want to do that you will have to deleat them manualy.
First of all, it's spelled delete, not "deleat", Second of all, It's IMPOSSIBLE to Delete mii channel because you'd be left with NO MIIs!
You just pay for it once
First you must get an app. While the app is installing, you type in the name of the app that you want, then click install app. The app will start installing without the password. This method may not work if you have to pay the app.