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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. Separate single word tags with spaces and add phrases in quotes.
Adding tags to Flickr images makes it easier for people to search for a specific picture. Once you finish uploading an image to Flickr, then Flickr will ask you if you want to add a description. Change the title of the image to what you like, add a description, and tags. Separate each tag with a comma.
Here's how you can add tags to a photo which is already uploaded: