If you have recommended version (1.4.7):
1. Download LiteLoader:
http://eq2.co.uk/minecraft/mods/
Download the
liteloader_1.4.7.zip version.
2. Download Macro/KeyBind at same site:
http://eq2.co.uk/minecraft/mods/
Download the
mod_macros_0.9.8_for_1.4.7.litemod version.
3. Open FTB Launcher, press the Edit Modpack button.
4. Go to the JarMods tab, click Add Mod, select liteloader_1.4.7.zip file.
5. Go to Mods tab, click Add Mod, select
mod_macros_0.9.8_for_1.4.7.litemod.
6. Play the game.
These instructions should work for newer version too. Just download the right liteloader/macros mod version.