I only know how to do this on Windows (but it should be similar on any OS, you will just need to find the correct location yourself - google search would help with that).
On Windows:
Go to your User Folder - on Windows 7/8 this would be:
[SYSDRIVE]:Users[your username]
(ex. C:UsersJohnDoe
)
In this folder there should be a folder called .AndroidStudioBeta
or .AndroidStudio
(notice the period at the start - so on some OSes it would be hidden).
Update
Now, Android Studio settings is at:
C:Users<Your User>AppDataRoamingGoogle.AndroidStudio4.X
Delete this folder (or better yet, move it to a backup location - so you can return it if something goes wrong).
This should reset your Android Studio settings to default.
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