How To Change The Tags On The Posts Already Published?

So, I have decided to make my own cryptocurrency blog using Steemit. As you might see, I have already submitted multiple posts. Now, I want to change all of the posts tags to something else. Is this even possible? When I click edit on my posts and change the tag, I get the message "Transaction failed: comment.last_payout == fc::time_point_sec::min(): DISMISS" once I press Update Post. So, are there any other methods where I could change the tags? Thank you all for your replies!