Template HTML can't seem to make it work

I have bought a HTML template from Envatomarket but can’t seem to edit it, I’ve tried to test it in couple different ways to see if it changes in browser but didn’t seem to work.

Anyone with experience in purchasing template?

Can you contact the seller?
When I buy a couch I at least expect some customer service from them

Did you try to change the code itself, or only made edits in the browser?

I did he asked me if I know how to code, I solved the problem but my biggest challenge atm is that when I have to change something it has to go to through all of the pages… kinda sucks