If you activated the new Inbox Tabs then after a while you find yourself not liking them that much and would like you old priority inbox back, this is what you need to do.
If you want to make a clean install of the new OS X Mavericks or even the older versions of Mac OS X, than I strongly suggest you to create a bootable OS X key or a drive.
Submitting tutorials to Dreevoo.com is simple and can be done real quick. Here is a tutorial to show you how easy it really is to submit a software related tutorial, plus you get paid.