To start deleting unwanted jailbroken apps, open Cydia and select "Installed" on the bottom to open the page containing all the Cydia-related apps currently installed on your iPhone. Once inside, you'll notice the list is organized alphabetically to make searching easier. So scroll down until you find the tweak you want to remove, then tap on it to take you to its page. Within the app's Details page, select "Modify."
On the prompt, tap "Remove" to proceed to delete the app, then select "Confirm" on the following confirmation page to finalize removal. Cydia will now delete the app file by file, so sit back and wait for it to finish up. Once it's done, either tap on the "Return to Cydia" to go back to the app or "Restart Springboard" to perform a soft reboot.