Fashe - Change Hover State Colors

Hi Noda,
I’m new to this and I’m so sorry for hijack this post. I can’t seem to find the spot where i can post my own question. I’ve the same issue as this user and was hoping you can show me where do i need to put the coding that you’ve shared on this post?

https://colorlibsupport.com/t/fashe-theme-product-description-showing-twice/

Thank you so much and I appreciate your help!