Here's how I do it when I have the bookmark setup.

1. I browse to a torrent site ex. piratebay.org
2. (in microb) slide my finger from the left edge of the screen on to it
3. Press the highlight text icon that appears
4. Highlight the infohash I need
5. Press the bookmark icon in the bottom toolbar
6. A .torrent file downloads and browser asks me to open in transmission or torrent program of my choice
7. Profit!

Hope this helps.

Cheers