I’ve just been over to your Facebook page to check which version of the business page you’ve got, and you’re like me still on the old one meaning we’ve got those little boxes (tabs) that we can put links into.
We’ll be swapping (no choice) to the new version of business pages soon. You can see what the new version will look like here - https://www.facebook.com/business/news/A-Streamlined-Look-for-Pages/ - all the tabs are disappearing and going under the ‘More’ section. I’m not sure how you add links into that as I haven’t got it yet and I’m holding out as long as I can before I get switched because I like the tab buttons.
If anyone’s got the new version they might be able to tell you what you’ll need to do and whether it’s worth doing it while you’ve still got the old business page.