To insert creative-commons-licensed images into your posts from Flickr, please follow the steps below:
Step 1: Go to your Dashboard>Plugins, find photodropper plugin and activate it
Step 2: Go to a new post, click on the balloon icon above the tool bar. You will be asked to say yes to legal stuff.
Step 3: Type in the search box your keyword for an image, e.g., flowers
Step 4: Choose an image, click on Insert into a post, insert into a post again and choose the photo attribution location.
Watch the video on how to insert the images using Photodropper
Note: Avoid using Internet Explorer with this plugin