Keyboard shortcuts

Key legend
Space key
Shift key
Right arrow key
Left arrow key
Items navigation
⎵, t
Toggle current item (open, close item in list view)
m
Mark current item as read if unread or unread if read
⇧ + m
Mark current item as read if unread or unread if read and open current (useful in list view and unread filter)
→, n
Go to next item
←, p
Go to previous item
⇧ + n
Go to next page
⇧ + 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
⇧ + o
Open current item in current window
s
Share current item
a
Mark all items, all items from current feed or all items from current folder as read
*
Star/Unstar current item
z
Open all unread items from current page in new tabs and mark items 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
?, F1
Go to Help page (this page)

Configuration check

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