You need to use the Ray icon at the bottom of the horse's picture.

Demios
Thank you for the suggestion. I did try clicking on the icon and it will pull
Up the Rays, but it puts other horses in the picture. It will show horses to pick
From, but not the horse I need. I tried typing in its name and it says no
Horse found? I tried to just add another Helio and it won't let me.
The horse is under my custom page. It's Angel Of Midnight. A wing horse
. It let me add the coat. Any other ideas?

Make sure you do not click the Helios’ Ray in the list of BMI items, as that leads you to the general Helios’ Ray item in the black market, which is why you’re given a selection of horses to use it on. To change the background of a specific horse that already has the item, click the horse, and then click the picture of the Helios Ray directly beneath.

Again do *not* click the Helio’s Ray in the list of items next to tack in Characteristics tab. *Do* click the Helios’ Ray directly under the horse. You should see 4 circular icons: Animation, Golden Apple, Helios’ Ray (click this one), Apollo’s Lyre.

Good luck!

You only get a selection of horses if you click the HR from your black market list.

You must click it from the icon actually on the picture of the horse. When selected from the horse's page it only offers the item for that horse.

Below the horse, I see the 3 icons the Ga, Helio, and Lyric.
I click on the Helio it takes me to the page with lots of
Helios, but it will not bring up the right horse. It brings up
A list of others. I tried to type in the name and it says
No horse available. I just tried again. Still no luck.

What you need to do now is clear your cache and cookies in case your device is clogged with old information. Log back in again and chack if it works. If it is still not working you will have to open a ticket with Contact Use. If you are opening the Ray from the horse's picture you should not see any other horses.

check not chack

Oh my stars. I finally got it to work. Doing it on my phone
It would not show up right under the horse. I just finally tapped
right under it and it finally popped up.
Thank you a million for your help. I just trying, and finally it works.
I was so frustrated. Thank you so much. Y'all are the best

Thank you everyone for your help