How to add a link on the menu of a e-commerce site built by Magento 2.0

Question

Premise / What you want to achieve

I want to add a anchor text on the main menu of myhomepage. I don't know how to achieve that via the backend system of Magento 2.

発生している問題・エラーメッセージ

I searched the solutions on Google, all the solutions said it cannot be set up on the magento backend and has to be done after accessing the files on the server.

該当のソースコード

Please check the code on our site.

試したこと

I tried to create a new category on the backend of Magento, but it doesn't allow me to add an existing link.

補足情報（FW/ツールのバージョンなど）

N/A