Click on the three dots context menu button. A context menu will open. Now, click on the Language Manager button.
A new window called Manage Language Links will open. Here, click on the Select language drop-down menu next to the name of the page/blog post.
Enter the language of your choice. You can either type in the language or choose from the list.
Click the Save button after you chose the language.
A pop-up dialog will appear. You should reload the page to see the changes.
You may not see any changes after a page reload. This is normal if there is no link established yet. Once at least two pages are linked to each other, a button to switch languages will appear.