How to downgrade iPhone 5s to iOS6?

I really enjoyed the new operating system for a few months but after awhile I started to miss iOS6! Can anyone help?

No there's not a way to do that. Even if there was a way, the 5s would not work on iOS 6.

I think you can do it by jailbreaking it.

This step will work for you:

First, you need the iTunes 11.0.5 or more previous version of iTunes. If you are running the latest version, uninstall it first.
Once you uninstalled the latest, restart your PC before downloading the previous version of iTunes. If you encounter any error during this process related to "iTunes Music Library.xml" then head over to the iTunes music folder and delete this file.
Download the latest version of iFaith as well as the iOS 6.1.3 firmware or 6.1.2 firmware.
Launch iFaith and click on "Build "*signed* IPSW w / Blobs." This will begin the custom firmware creation process, and when prompted, select your SHSH blobs. IFaith will then create a downgradable iOS 6 firmware file for your iPhone 4.
Once the firmware file has been created, follow the on-screen instructions for putting your device into Pwned DFU mode. When entered into this mode, launch iTunes, select your iPhone and hold down the left SHIFT key and click on Restore iPhone. Browse to the custom firmware file created by iFaith.
Once the restore process is complete, you have successfully downgraded your iPhone 4 from iOS 7 to iOS 6.1.x.

Can't.