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This plugin can be installed like all the other plugin. It requires no extra configuration except being activated.

1. Extract the downloaded zip file to the /wp-content/plugins/ directory. You might also want to use OneClick Installer to automate this step.
2. In the Admin control panel, goes to the Plugins page and activate the mini-flickr-gallery plugin.
3. Configure the plugin under the Options page (Optional).
4. Start building your flickr galleries by using these codes:

Gets photos from all the users with these tags

[miniflickr tags="travel, sunset, landscape"]

10 last images from my portfolio or shows the link if javascript is not enabled

[miniflickr userid="56755410@N00" tags="portfolio" perpage="10" ] Portfolio[/miniflickr]

Gets photos from all the users with these tags

[miniflickr tags="poster" groupid="92076845@N00" perpage="5" ]

Check this link for more examples