Bookmark the URL
Bookmarking is something that is provided by the browser.
On laptop/Desktop
Browser: Chrome
You should be able to see the star like the one below:

Steps:
Click on the "star"
You will see the link appearing in the next level

On Phone
Browser: Chrome
You would be able to see 3 dots like the one below:

It would open "Menu" like the one below and click on "Bookmark":

In case you are not able to see the 3 dots, please search for "How to bookmark" in google with the name of your phone.
On laptop/Desktop
Browser: Chrome
You should be able to see the star like the one below:

Steps:
Click on the "star"
You will see the link appearing in the next level

On Phone
Browser: Chrome
You would be able to see 3 dots like the one below:

It would open "Menu" like the one below and click on "Bookmark":

In case you are not able to see the 3 dots, please search for "How to bookmark" in google with the name of your phone.
Updated on: 16/09/2021
Thank you!