Help setting up a SIP Account

Hi, I have a RB750 and a SIP Phone behind it, I need to register with the VoIP provider but I have failed to do so. Very new to RouterOS, I have researched and there is so many information but nothing straight forward.

Could someome direct me on how to open the UDP ports 5060-5063, 69, 8000-80003, 10000-20000 so my SIP Phone will register with the provider.

Any help is more than welcome.