Put up a picture of an A. ocellaris in a LTA on your tank so they can see it!
Or, gather the anenome fish and anenome together in a small confined space for awhile so the anenome fish realizes the anenome is ok.
Or, just give up and buy another anenome fish that is already hosting in a LTA.
Good luck, you might not be able to get them to host. They can live without each other in our tanks.