Remove Front Sprocket & Collar then you can access the seal.
Take your time removing the seal as you do not want to damage any faces for fear of the new one leaking.
Before you pop it out take note of how far in the cover the face is so you can get the new one the same depth.
BUT
Before you remove it make sure it is actually leaking and not just chain lub residue or a leak above the seal giving you a false diagnosis as these seals very very seldom leak.
Take your time removing the seal as you do not want to damage any faces for fear of the new one leaking.
Before you pop it out take note of how far in the cover the face is so you can get the new one the same depth.
BUT
Before you remove it make sure it is actually leaking and not just chain lub residue or a leak above the seal giving you a false diagnosis as these seals very very seldom leak.