Open the mod menu (usually via a GUI keybind set in the controls menu) and set your preferred activation key.

Warning: There is no single official "Telly Bridge Mod" by a specific author. It is usually a feature inside larger mod packs. Downloading from random .jar websites can give you malware.

Telly Bridge Mod 1.8.9 Download: Master Fast Bridging in Minecraft

Tracks your blocks placed per second (BPS) and success streaks.