Hello, @ouani .
Thank you for reaching out and posting this question.
Since you’re using a third-party theme, then we’d recommend getting support for your theme from the theme designers. However, if the theme designers don’t offer customization support, then you can also consider hiring a developer to assist you with the theme. Should you need help finding a developer for your store, then you can take a look at our directory of certified developers on Shopify Partners.
If you have any other questions on this topic, then don’t hesitate to let us know.