i really need some help . plz help me

hello guys . my english is not so goood . im from iran and my job is computer modding product like gpu backplate / fan grill / cable mod and ....

My country has several years of sanctions, and I was able to learn my work with many troubles. Now I really need some help for the Fancyproduct settings on my site. Site

https://www.v1tech.com/shop/backplates/custom-design-backplate/

It is well - used. Can anyone lead me to make something like this? Isthere a video link that will help me? I apologize for my stupid language.Thank you.