With going by the little bit you said, make sure it all uploaded. Check the folder
/includes/templates/YOURCUSTOMTEMPLATE
and make sure you see the file called template_info.php. If it is not there, then it didn't install properly. Try installing it again.
If it IS there, go to you admin screen , tools, Template Selection
The new template should be listed on the right side under the EDIT button. Click on EDIT and choose the New Template. Then open your Online Catalog and see how it looks.
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