How to add some content to all posts? Easy, install this plugin to your website/blog. When activated, a new option in the Posts menu will be able, Add To Post Footer option. Click there and insert the content what you want to add to all posts footer. Save it and it’s done. As you activate the plugin, all posts will have the content. If you don’t want more the content, just deactivate the plugin.

Add To Post Footer

Add some content to the bottom of all your posts. You can add images and HTML too. Install and activate it, it's easy!

Silkalns

WP Chill

Remove or replace footer credits (or any text or HTML in page) before page is rendered. With this plugin there is no need to modify code such as footer.php which if done incorrectly can cause your site to break or new theme updates will stomp over your changes requiring you to remove footer credits on each update.
This plugin has very minimal options to keep things simple and easier to use. You enter the text or HTML that you would like to find in one text box and the text or HTML that you would like to replace in another text box (or nothing to remove). Go <a href="https://cpothemes.com/remove-powered-by-wordpress/" rel="nofollow ugc">here</a> to view my step by step tutorial with screenshots and video.

Remove Footer Credit

It seems to work, but not as intuitive as it should be. You need to copy the code that makes up the footer porting you wish to move and paste that into the box. Wish there as a way to simply way to remove it.

Seems to Do Nothing

Remove or change footer credits or any text or HTML without modifying code.

Add To Post Footer vs Remove Footer Credit