[Need For Help] How to change default host port in the YCQL API?

[ZjuYTW]

I don't think the doc has a explain of this, and now I have connected successfully through 9042. But I want to change it to my customized port to avoid port occupied, and I can't find the a corresponding API about it :( Please help me with it if there do exist a API to call

Thanks in advance!