1. go to Advanced Settings > Click DOM node (CSS Selector)
2. install this chrome this plugin to copy the CSS selector ( that is the ID of the object you wish to click ) and paste it into the Click DOM node (CSS Selector ) field.
3. run a test crawl using Max-Pages = 1
if that looks good..
then you are ready to run a full crawl, and you will need to re-add the same settings.