Removing the title of website from h1 to h2 on blog posts

I have the travelify theme. I noticed on my pages (other than home page) that each page has two h1 tags and one of them is the title of my website and the other is the blog title that i assign it when creating a new blog post. You should never have two h1 per page so my question is , other than the home page, how do I get my site title (website name) to transition to an h2 and my website description to an h3.