Authorizing Flickr:

Once the plugin has been installed and activated, go to Galleries > Settings using the menu on the left side of the WordPress admin.
Under “Media Sources” on the left side of the page, click “Flickr”.
Click the “Grant Access” button. When you click this button one of four things will occur:

authorice-flickr

1. If you are already logged in to your Flickr account and have not granted access to the plugin in the past, you’ll be redirected to a Flickr page allowing you to grant access. Clicking “Ok, I’ll authorize it” will return you to the Flickr settings page with a message that you’ve successfully authorized the plugin to access your account.

2. If you are not already logged in to your Flickr/Yahoo account and have not granted access to the plugin in the past, you’ll be redirected to a Yahoo login page. Once logged in you will be redirected to another page allowing you to grant access. Clicking “Ok, I’ll authorize it” will return you to the Flickr settings page with a message that you’ve successfully authorized the plugin to access your account.

3. If you are already logged in to your Flickr account and have granted access to the plugin in the past, you’ll be redirected back to the Flickr plugin’s settings page with a message that you’ve successfully authorized the plugin to access your account.

4. If you are not already logged in to your Flickr account but have granted access to the plugin in the past, you’ll be redirected to a Flickr login page. Once logged in you will be redirected back to the Flickr plugin’s settings page with a message that you’ve successfully authorized the plugin to access your account.

authroized

Revoking Plugin Access/Switching Accounts:

Navigate to the Galleries > Settings page and click “Flickr” on the left side of the page.
Click the “Remove Access” button.
You should see a message stating that “MaxGalleria is no longer authorized to access your Flickr account.”
You can now re-authorize with another account.

settings-unauthroized

Adding Flickr Images to a Gallery:

If not already authorized, complete the Authorizing Flickr step above first.
Choose a gallery from the Galleries page or create a new gallery by clicking Galleries > Add New.
Click the Add Images button.

add-images

In the resulting media manager popup click Flickr in the left pane. Thumbnails of up to the first 20 images from your Flickr account should be visible.

flicker-images-list

If you have not yet authorized the plugin to access your Flickr account a notice to do so will be shown here instead.

Click the image or the checkbox below the image to select it. Choose as many as you would like. To view the next 20 in your Flickr account click the “Load More” button.

mg-not-authroized

Once you’ve selected all the images you would like to add to the gallery click the “Add to Gallery” button. Be patient as this might take awhile depending on the number of images selected.

Once complete you should be taken back to the gallery page where you can customize and publish your gallery.
To add the gallery to a page or post copy/paste the shortcode provided.