It is possible to add tags to the saved articles and also while saving articles. This is how you can do that:

Mobile: 

   While saving:

• While you are saving an article from the in-app browser, the information on the bottom bar will change momentarily. Click on the down arrow on the right side of it.
• Click on the (Add Tags) icon to add tags to the article.
• You can select tags from the list of tags that appear and/or create a new tag (To learn how to create new tags, click here).
• Then click on the “Save” button at the bottom right to save.

To an already saved article:

• Find the article you want to add a tag to from the “Recently Saved” list on the home page or from different collections under the “Collections” section (To see how to access different collections, click here).
• Click on (Add Tags) icon at the right of the article card.
• Click on “+TAG” and select from the existing list of tags or create new one. 

More:

Tags can be added to PDF and HTML articles while viewing/reading in the in-app viewer too. 

• Click on(Ellipsis) at top right of the in-app viewer.
• Then, click on “Add Tags” and select tags from the existing list or create new. You can select more than one.
• Click on the “Save” button at the bottom right to complete the process.

Web: 

While saving:

• While you save an article on the WebApp, a popup appears on the top right of the screen with two text boxes for “Tags” and “Collections”.
• Type into the “Tags” textbox to add existing tags from the dropdown suggestion list or type new tags and press enter.
• Click “Save” to complete the process.

To an already saved article:

• Find the article you want to add the tag to from the “Recently Saved” list on the home page or from different collections under the “Collections” section.
• Hover on the article card you would like to add a tag to, and the tag option (highlighted in maroon colour) will appear at the bottom of that card.
• Click on “+Tag” and select from the existing list of tags or type new tags and press enter.
• Click on “Save“.

Tag can be added to HTML articles while viewing too.

• Click on Tag icon (third from left) on the menu at the top in the in-app viewer.
• Select tags from the existing list or type new tags and press enter.
• Click “Save” to complete the process.