Most of us were taken by surprise by the release of the Pangu iOS 9 jailbreak yesterday, and although this is exciting news, there are still some things to keep in mind at this time, such as the fact that many tweaks won't be working right off the bat.
The good news is, Cydia Substrate has been updated for iOS 9. The bad news is, your favorite tweak might not have been yet. Fortunately, the community has once again come together and is working on an iOS 9 jailbreak tweaks compatibility list to help identify what tweaks are currently working and what tweaks aren't.