To remove the drivers wiper arm.
Pop out the plastic cap.
Undo and remove the nut within.
Then directly beneath the actual wiper arm, (right above the plastic trim) you will see a square(ish) looking bracket where the second arm pivots on. A single small Allen cap bolt holds this in place, simply loosen the bolt and it will pop upwards.
Watch for the water feed pipe to the washers, this should simply pull off at the top.
When replacing do the reverse but tighten the small Allen bolt LAST! this is to ensure it does not foul the plastic trim or anything else. You might have to adjust it a few MM to get it perfect.