Turn page into an index style page

Site URL: https://mouse-hypersphere-5zyw.squarespace.com/

hello!

Website: https://mouse-hypersphere-5zyw.squarespace.com/

Password: 123

I'm happy with my layout, but ideally would like to have links to each section in the header. I believe this is called an Index. How would I achieve this? I can't find the option to create an Index page in Main Navigation. 

Any help is much appreciated. Thank you! 🙂

It is a page in SS 7.0

Your site is 7.1, no index page.

You can use anchor links.

This worked perfectly, thank you!

Is there a way to make the transitions smooth and scroll down the page to the correct section? Currently it seems to load the page again but at the linked bit.