How can Madara Uchiha use Susanoo when he does not have 2 mangekyou abilities in his eyes? How can Madara Uchiha use Susanoo when he does not have 2 mangekyou abilities in his eyes?
First of all, it is not mentioned anywhere that Madara doesn't have two Mangekyou abilities in his Sharingan. It is simply not revealed just like Izuna's Mangekyou abilities.

Second, as mentioned on the Wikia,


  Once a user awakens the Mangekyō in both eyes, or the ability of both of their eyes, they are able to perform Susanoo


it is not necessary to have any abilities specific to their Mangekyou Sharingan in order to perform the Susanoo.