MyMUE is live and earning you rewards as we speak, it is just not publicly available yet until all back end integrations have been completed.
MyMUE is and will remain a shared MasterNode service, so "staking" is not what the service offers.
The platform operator M P Hosting (pjcltd) may offer stake pools in the future, I don't know, but as soon as MyMUE is live, we'll let everyone know.