Rocketmail and ymail incoming and outgoing mail server????

I am trying to set up my TMobile Dash with my new Rocketmail and YMail email accounts ( I currently have yahoo address set up) but I can't find the right incoming mail server and outgoing server to set up the rocketmail and ymail accounts??? Any ideas???? Thanks!
Update: Thanks for your response....but what is a Plus account? Exactly what do I have to type in? Sorry, I don't know....
2 answers