If someone sees "You must log in to continue" when accessing what should be a public web page (that anyone should be able to see, even if they don't have a Facebook account or aren't logged in), these changes will need to be made by whoever owns the Facebook page:
From https://www.facebook.com/help/537592652938493 :
If your Page has age or country restrictions, you won't be able to see it when you're logged out of Facebook.
To see your Page when you're logged out, you'll need to remove all age and country restrictions:
<![if !supportLists]>1. <![endif]>From your Feed, click Pages in the left menu.
<![if !supportLists]>2. <![endif]>Go to your Page.
<![if !supportLists]>3. <![endif]>Click Settings at the top of your Page.
<![if !supportLists]>4. <![endif]>From General, click Country Restrictions, then click x next to any listed countries and click Save Changes.
<![if !supportLists]>5. <![endif]>Click Age Restrictions, select Public and click Save Changes.
More info: https://www.facebook.com/help/www/778445532225441