How to Change the Tagline of a Post in WordPress

1. Sign in to your WordPress site, and click 'Posts.' Click the WordPress post with the tagline you want to edit.
2. Scroll down beneath the text editor to find the custom field that generates the tagline. The field's wording will vary, depending on your theme's author, but it should say 'Subtitle' or 'Tagline.' If you don't see the custom field box, click 'Screen Options,' and then check the box next to 'Custom Field.'

3. Click the 'Value' field, where the tagline is displayed. Delete the value and type the new tagline in the field. Click 'Update.'