To recline, lean forward slightly, lift the lever, then push back to the desired position and release the lever. Lean forward and lift the lever to return the seatback to its normal position. Using body pressure, lean forward and rearward on the seat to be sure the seatback has latched.

Recline Lever

WARNING!
Do not ride with the seatback reclined so that the shoulder belt is no longer resting against your chest.
In a collision you could slide under the seat belt, which could result in serious injury or death.