Keyboard shortcut

Items navigation
'space' or 't'
When viewing items as list, let you open or close current item (toggle current item)
'm'
Mark current item as read if unread or unread if read
'shift' + 'm'
Mark current item as read if unread or unread if read and open current (useful in list view and unread filter)
'n' or right arrow
Go to next item
'p' or left arrow
Go to previous item
'shift' + 'n'
Go to next page
'shift' + 'p'
Go to previous page
'j'
Go to next item and open it (in list view)
'k'
Go to previous item and open it (in list view)
'o'
Open current item in new tab
'shift' + 'o'
Open current item in current window
's'
Share current item (go in configuration to set up your link)
'a'
Mark all items, all items from current feed or all items from current folder as read
Menu navigation
'h'
Go to Home page
'v'
Change view as list or expanded
'f'
Show or hide list of feeds/folders
'e'
Edit current selection (all, folder or feed)
'u'
Update current selection (all, folder or feed)
'r'
Reload the page as the 'F5' key in most of browsers
'?' or 'F1'
Go to Help page (actually it's shortcut to go to this page)

Check configuration

open_ssl
You should be able to load https:// rss links.