How to get ios7 on my iPhone 4?

My iPhone 4 is at 6.1.3 and i know its suppose to be at 6.1.4 but i don't even know how to get it to that ios format, what's wrong with my iPhone 4 and how do i fix it to have 6.1.4 and ios 7

Go to settings, go to general, click on software update. It will show you the newest update (iOS 7). Update it, it will take around 45 minutes, but you can continue using your iPhone while it updates. If it doesn't update the first time, keep trying, you won't need to wait the 45 minutes again. Apple servers are busy because it just came out today. Hope this helps!