If you do not know how to download and open a zip file on your mobile device we have the following suggestions:
Install an app on your device that can unzip files such as Kpressor, Zipped, ...
Or download the zip file to your desktop/laptop, unzip there, and then sync the unzipped files to your mobile device.
Or use the mobile login (see FAQ 10). From that login you can directly step into zipped files.