It is extremely important that locking tuners are not used like normal guitar tuners. With normal guitar tuners, the strings are wrapped around the adjusting axis/post. This can cause the strings to slip slightly and thus put the guitar out of tune.

This is avoided with locking tuners. But here it is extremely important that the strings are not wrapped around the adjusting axis/post.

Open the clamping screw of your Monkey Locks - Locking Tuners and insert the string through the hole and pull the string tight. Clamp the strings by locking the clamping screw again. Cut off the excess string. Now tune the guitar.