Just follow the steps and it should be easy enough.
Are you a visual learner like me? Try watching this video that I made showing the whole process step by step
Step 1: It's Really Easy!! Just Follow the Steps Shown in the Video
Step 1 - Open the image that you want to save and hit refresh to go to the permalink
Step 2: Keep Going
Step 2 - Click the image with the right button and hit inspect element (firefox)
Step 3: Almost Done
Step 3 - Find the right div class,select the url and open it on a new tab
Step 4: Last Step
Step 4 - Right click the image and save it to your gallery. You are DONE!!
Step 5: Visual Learner? Try This Video That I Made Showing the Whole Process