How to add tags to multiple Flickr photos at once?

Having a descriptive keyword tag on your photos makes it easier to find in Flickr search. At max, you can add up to 75 of your own tags and there are some which Flickr adds on the basis of image recognition technology. 

Here's how you can add tags to multiple photos at once:

1. Open the Flickr App on one of your devices.
2. If you don't have the Flickr App installed on your device, you can easily download the Flickr App from Google Play Store if you are an Android user or from the Apple App Store if you are an Apple user.
3. If you don't wish to download the Flickr App on any of your devices then you can simply put up the Flickr URL at the address bar of your device browser which is - https://www.flickr.com/ and open Flickr without downloading it.
4. Once you open the Flickr App, sign in to your Flickr Account using your Flickr username and Flickr Password. 
5. After logging in to Flickr, it will take you to its Homepage.
6. On the Flickr Homepage mouse over "You" which is located at the top left corner of your screen and select Camera Roll.
7. Select one or more items.
8. Click on Edit.
9. In the "Add new tags" field, enter your keywords.
10. Click on Save.