How to access onion link?

It's really very easy to access a onion hidden link.
All you need is a simple tor network setup.
Tor network is enabled on tor browser from torproject.org

Download tor browser or orbot from torproject.org
And connect to network and browse the internet safely.

Onion links are only opened over tor network. Normal browser can't access a onion link.

Make sure you disable JavaScript in your settings of browser.
By default JavaScript is enabled. So if you care about your privacy you should definitely stay away from JavaScript.

JavaScript steals your browser data you can do some research on the internet.

My recommendation would be stay away from JavaScript sites.