How to access the Internet through a mikrotik router proxy?

Question

network hardware

There is an Asus router and a Mikrotik router in the same local area network. I am connected to an asus router (there is no Internet, only local, but devices on the provider's network 10.0.0.0/16 are available, including a Mikrotik Internet router). how to raise a proxy on Mikrotik so that you can access the Internet through this proxy by entering in the client (for example proxydroid or 3proxy there, etc.) proxy ip: port.