Click on this link, http://itunes.apple.com/us/app/owncloud/id543672169?ls=1&mt=8, to open the owncloud client in the App Store. Download and instructions are here https://owncloud.com/products/mobileapps/.
Mac Laptop or Desktop running OSX Yosemite
Click on the following link to install the software https://owncloud.com/download#desktop-clients.
Download and instructions here https://owncloud.com/products/desktop-clients/. “Simply copy a file into the directory and the ownCloud desktop client does the rest. Make a change to the files on one computer, it will flow across the others using these desktop sync clients. Always have your latest files with you wherever you are.”