how to simultaneously edit Libreoffice Calc spreadsheets in Mac OSX and Ubuntu 14.04

I did whatever was said in the following link:

https://help.libreoffice.org/Common/Collaboration

But what after that? What should I do in the libreoffice calc from the Mac side? I would appreciate if someone helps step by step till the end. Sorry for being so naive but I can’t help it. Thank you guys :slight_smile: