It is not displaying … I added Related Products but It is now showed on product detail page.

1. would you please tell me what to do?

sample page : http://demo.snstheme.com/presta/sns-kalolia/en/blouses/2-blouse.html

2. there is 4 tabs on bottom of product detail page .. can I replace one of tab to
related product ? which file should I look into it?

thank you