The blog tagline is the subtitle to the blog title. When you sign up for a WordPress.com blog, its tagline will be the sample text “Just another WordPress.com weblog”. You edit or delete it in Settings > General.
(In Settings > General you can edit the blog title as well. Editing the blog title should not include deleting it, as this is very bad for search engines. You can hide the title if the theme supports that option –see list here– or if you have the Custom Design upgrade.)
The standard tagline shows up in all themes (usually in the header area) except the following ones:
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Albeo Almost Spring Banana Smoothie Benevolence Blix DePo Masthead [see note 1] DePo Square [see note 2] Digg 3 Column Dusk Fadtastic [see note 2] Fleur de Lys Flower Power Fresh Bananas |
Garland Girl in Green [see note 2] Greenery Green Marinée K2-lite [see note 3] Neo-Sapien [see note 3] Pool Prologue Redoable Lite Retro MacOS Rubric |
Shocking Blue Green Silver is the New Black Solipsus Supposedly Clean The Journalist v1.3 [see note 2] Thirteen Toni Unsleepable WordPress Classic |
Notes:
1. DePo Masthead: doesn’t display the standard tagline, but you can add one under Appearance > DePo Options: Author Box Text.
2. DePo Square, Girl in Green, The Journalist v1.3: tagline displayed in the sidebar (under “About” or “The Author”) if you don’t activate any widgets. Same thing for Fadtastic, if you don’t activate any widgets in the second sidebar (erroneously labeled “Bottombar”).
3. K2-lite, Neo-Sapien: no blog title either.
4. In Under the Influence the tagline can be hidden instead of deleted (Appearance > Theme Options: Description).
5. In themes that don’t display the tagline, you can write a substitute in a Text widget or in the newly introduced Gravatar widget.
wordpress tips 
Hm…
The tagline is displayed in Fadtastic. (we agree it’s not the nicest theme?) It is very oddly displayed as “About” in its sidebar that is not customizable.
Posted by Tess | August 8, 2009, 21:10Oops!
Not exactly as you’re saying, but thanks for spotting the oversight Mrs Assistant Theme Examiner! Post promptly updated!
(Fadtastic: I hate both the idiosyncrasies and the color combination.)
Posted by Panos | August 8, 2009, 22:19Ah, correct. I did not look that far!
No promotion to Assistant!!
remain
~~your humble servant~~
Posted by Tess | August 9, 2009, 05:59Please upgrade to ~~less than humble friend~~
Posted by Panos | August 26, 2009, 07:29I’m using DePo Masthead outside of WP.com. Theme options are not availalbe, What file would I look to make that change, “function.php” or “header.php?”
Posted by martesque | May 19, 2010, 22:14Sorry, I can’t help with that: I’m only experienced in wp.com blogs, not self-hosted ones. Different software…
Posted by Panos | May 20, 2010, 02:58Is it possible to change the font size of the text in the existing tagline?
Posted by Virtual Girl Musing | December 12, 2011, 07:23No, unless you buy the Custom Design upgrade.
If you’re talking about the blog linked to your username, I would suggest you look for a better theme instead of the outdated one you have selected.
Posted by Panos | December 12, 2011, 07:30Thank you, Panos.
Posted by Anonymous | December 12, 2011, 14:59Thank you, Panos (wasn’t logged in when I posted this, above).
Posted by Virtual Girl Musing | December 12, 2011, 15:01