Step 1: Log in to your WordPress administration dashboard and go to the respective POST.
Step 2: Locate and click on the ‘Tags’ field in the right hand sidebar
Step 3: In order to add a new tag, enter a word that relates to the article into the Tags field and click “Add.”
Step 4: To use the existing tags, just click the “Choose from the most used tags” link to view common tags you have already used.
Step 5: Now save and update the POST to save the changes made.
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