Templates in the Movable Type (MT) system are your method of defining the design and layout of your site. They are highly configurable, and if you want to get really fancy with them you should have a good understanding of HTML and CSS. For more information on Templates please see the templates section of the Movable Type user's manual.
If you don't know much about CSS and HTML, and you'd like to change the appearance of your site, the easiest way to do so is to change the Stylesheet template for your blog. And the easiest way to do that is through the MT plugin called the StyleCatcher.
To access the StyleCatcher simply log into your blog, click on Templates in the left hand menu, and look for the StyleCatcher link at the bottom of the screen. However, please remember, in order to use the StyleCatcher you must use the "default templates" on your existing blog.
Blogs created after November 28, 2005 all use the proper templates. If you created a blog after this date you may use the StyleCatcher without doing anything else. However, if you have a blog that you created before this date, follow these instructions:
Log into UThink, click on your blog, and then click on Templates. You'll note checkboxes next to all the templates on the first screen. Click all of them (or click the checkbox next to "Template Name"). Then, use the "More actions" drop down menu to the right and select "Refresh Templates." Do the same thing for the tabs "Archives" and "System."
Once you've done that, enter the StyleChanger link at the bottom of the screen (under "Plugin Actions") and select a new style for your blog. You do not need to use the "Find Style" button. Just click on "Saved Themes" if none are showing.
If you make any changes to your blogs templates, and find that you have made a mistake somewhere, you can restore any or all of your templates to the default using the built-in Template Backup and "Refresh Templates" plugin instructions listed above.
Just in case you need them, though, here is a list of all the default templates and the content of each template: