Well, I clicked the green button to "Create New Wallet" and it generated a passphrase which I copied over to the Passphrase text box. Then what ? The "Wallet Open" blue button was still grey.
My bad, one tries to introduce improvements (and I think it is) but unfortunately it is also wont to cause some unintended difficulties. Note:
In an effort to encourage good security practices the passphrase login cannot be pasted but must be typed word by word.
If you have any further issues feel free to report them at:
https://github.com/porqup1ne/xcpfeeds.info-issues