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inside my moz report for duplicate contentit says that the photo gallery has duplicate content.

let me post and example.

is saying this site->http://www.yoursite.com//photogallery/name-of-the-page

site               photogallery   category page name

its being duplicated to all these other urls :

http://www.yoursite.com//photogallery/name-of-the-page-categoryone

http://www.yoursite.com//photogallery/name-of-the-page-categorytwo

http://www.yoursite.com//photogallery/name-of-the-page-categorythree

http://www.yoursite.com//photogallery/name-of-the-page-categoryfour

and so on!

each one has it own canonical tag to its own individual page.

the site structure is this:

http://www.yoursite.com//photogallery/

in here there are all the links pointing to the right categorypage

ie:

http://www.yoursite.com//photogallery/ >>>>

http://www.yoursite.com//photogallery/categoryone

pic 1

pic 2

pic 3

http://www.yoursite.com//photogallery/categorytwo

pic 1

pic 2

pic 3

http://www.yoursite.com//photogallery/categorythree

pic 1

pic 2

pic 3

http://www.yoursite.com//photogallery/categoryfour

pic 1

pic 2

pic 3

So i don't know how to interpret  Moz diagnose.

how could i interpret moz reports to find out what to fix and how to fix it?

Sorry for the long post! ;

I agree Ben, that coding into the theme itself is the best way to do this - however since there are a  few ways to do this task - we wanted to offer various solutions.

There is a plugin way – and a coding way…

I will explain both

Plugin version is good for individual posts / coding way is a mass archive way…

PLUGIN VERSION

Using a plugin called WordPress SEO by Yoast.. you can go into the previous posts and do the following.

Open the POST dashboard in your WordPress blog.

Find the post/s you are interested in working with.

Click ‘Edit’ post

Then scroll down to the WordPress SEO by Yoast section on the bottom anc click ADVANCED

From there.. you can select noindex / nofollow for that post – as well as a few advanced meta tags.

You can do this for any or all of your posts… 

CODING VERSION

Step 1
In your theme folder locate the following files:

/wp-content/themes/yourtheme/

Archive.php

Header.php

Open them both up.

Step 2
First thing to do is SAVE the header file as:

header-archive.php

with that new version open add the following code into the header section:

Then save it.

Upload that file to your wp theme folder online.

Step 3 now go to the open archive.php file and find and replace the following:

FIND:

REPLACE WITH:

Save and upload that file to your theme folder as well.

Now you have just MASS added a NOINDEX / NOFOLLOW to all of your archive pages – but NOT the individual post pages themselves.

Hope this helps!