I want to reset
Android Studio 0.2.13
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).
Go to your User Folder - on Windows 7/8 this would be:
[SYSDRIVE]:\Users\[your username] (ex.
In this folder there should be a folder called
.AndroidStudio (notice the period at the start - so on some OSes it would be hidden).
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.