You can use Zotero on a mobile device by installing a "Bookmarklet," a special link that saves items directly to your Zotero account on the web.
You must have a Zotero Account and your device must be online, to use Zotero on a mobile device.
1. Open the following link on your device and select the browser or device you use.
2. Follow the instructions provided on the Zotero page to install the bookmarklet on your device.
When you're on a page with a citation, select the Save to Zotero bookmark. Your browser will save the citation directly to your Zotero library online.
The screencaptures below are specific to iPads and iPhones.