I would like to customize the home page and product page adding the regular price crossed out + the discount price + the % of the discount like the pictures below. If someone can help me, I will appreciate it very much thank you
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 @Lia3
Please go to Online store > Themes > Edit code. Then, find the theme.liquid file and add the following code just before the tag (Ctrl + F and search for ‘’):
We hope that this can help you.
thanks for URL but i can see its work