So you have your Meta tag module installed and all the default meta tags configured. However, you still need to tweak the meta tags for a specific page, but the meta tag fields aren't showing up in the edit interface. Here's how to get those to show up for the various content types.
Go to Manage > Structure > Content Types. This displays the Content types listing page.
Click the Manage fields button next to the content type to which you would like to add meta tag fields to. This displays the Manage fields page for that content type.
Your page will likely have a few more fields on it. Search through this field listing to make sure the meta tags are not already there.
Click the +Add field button at the top of the list. This will display the Add field page.
From the Re-use an existing field drop down box, select Meta tags (field_metatags). Leave the Label as is. Click the Save and Continue button. NOTE: If this field does not exist within the Re-use an existing field drop down box, go to step (??)
ONLY COMPLETE THIS STEP IF STEP (??) COULD NOT BE COMPLETED: From the Add a new field drop down box, select Meta tags and enter a name in the Label field. Click the Save and continue button. Follow the instructions on subsequent confirmation pages until you return to the Manage fields page.
To confirm your changes, edit a page that is the content type to which you just added the meta tag fields. You should see them listed in the side bar.
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