Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.
Hi @Moise75,
This is Victor from PageFly - Landing Page Builder App
You can try this code by following these steps:
Go to Online Store->Theme->Edit code theme.liquid paste my code before element
Hope my solution works perfectly for you!
Regards,
Victor | PageFly
how can I change the title then? Will that work for only this product?
this only change the color I don’t want the color to be change I want the title to change is it’s black t-shirt change it to black T-shirt instead of Green
You can try again with this code:
Hope my solution works perfectly for you!
Regards,
Victor | PageFly