If you have a template and want to change this (and override it). Copy it to your design in the same directory structure.
Example:
copy
/design/standard/templates/toolbar/full/node_list.tpl to /design/YOURDESIGN/templates/toolbar/full/node_list.tpl
where YOURDESIGN is the one specified in the <i>SiteDesign</i> of <i>[DesignSettings]</i> in <i>site.ini.append.php</i> of your siteaccess.
In my site.ini..., I saw the following:
[DesignSettings]
SiteDesign=plain AdditionalSiteDesignList[]=base
What does AdditionalSiteDesignList mean, and how does 'base' design affect my 'plain' site design?
Also, in my /design/plain/templates/, there's no more directories that lead to /design/plain/templates/toolbar/full/. Does this mean I have to create my own and that EZPublish will be able to recongize my dir changes?
In my site.ini..., I saw the following:
[DesignSettings]
SiteDesign=plain
AdditionalSiteDesignList[]=base
What does AdditionalSiteDesignList mean, and how does 'base' design affect my 'plain' site design?
The short answer is: When eZ publish looks for a template, it starts looking in SiteDesign. If it finds the template there it uses that, otherwise it looks through all your Additional designs (Specified in AdditionalSiteDesignList). If the template is not found there either, it looks in StandardDesign.
Also, in my /design/plain/templates/, there's no more directories that lead to /design/plain/templates/toolbar/full/.
Does this mean I have to create my own and that EZPublish will be able to recongize my dir chang
Yes. When you create the new dirs in the plain design eZ publish will automatically find them (but remember to clear the cache).