If you are trying to add links to develop a blogroll and aren’t seeing a way to do it, you might be on the WP Customizer page.
If you’re seeing this
But you want to see this
Then do this:
Edit the url in the address bar of your browser:
https://wordpress.com/posts/pataphysicstoday.wordpress.com
To look like
https://pataphysicstoday.wordpress.com/wp-admin/
That is
https://
wordpress.com/posts/pataphysicstoday.wordpress.com
Then bookmark that page to get back to it when you need to.