If you want to change the text size generally, you might need to edit your
style.csslocated under:
./templates/
<yourtemplate>/style.css
open that file in some text editor and change the style sheet to fit your needs
(you may also login as admin in you 4images gallery, go to the ACP, select
Templates, open your template "Load theme" and then open the style.css "Edit templates")
look for setting like "font-size:"
and change the values to the size you wish...
That's for changing text size globally.
If you'd like to change just a specific piece on your templates, open the template file, where the text is located and change the text you need as TheOracle described...
Example: You'd like to change the size of "Log me on automatically next visit?" on the login form only?
open "user_loginform.html"
search for
{lang_auto_login}
and
change it to
<span class="smalltext">{lang_auto_login}</span>
* martrix ...uhm ...well, that actually is a stupid example, 'cause if I'm right, then it already
IS smalltext in the default template, but I guess it's fine to explain, how to proceed...
BTW: You might need to read the licence agreement of 4images to prevent problems... (consider this comment as redundant if you bought a 4images Copyright-Removal-Licence)