need the stratum url for zpool for sha-256
is the algo for the url sha256 or sha-256


The URL should be sha256.mine.zpool.ca.


  what is the port to use at the end of the url? (looks like different ones based on algo)


For sha256 you should use port 3333.


  what is #xnsub ? Is it needed?


It turns on extraNonce, which gives your miner extra room to work.