If you don't have existing slides to import, simply begin creating slides in your new file. The template is applied to the blank presentation. Select the template to see a preview of it, then click Create. If you don't have two tabs to select from under the Search box, you can change that. To navigate to a personal or workgroup template, select the tab next to Featured, which may be named Personal, Shared, or Custom (depending on the circumstance) and then open the folder that contains the template you want. Under New, you can navigate to a personal or workgroup template, Search for a template, or choose a featured template or theme from the gallery. If you need help knowing where to put a template file so you can apply it as described here, see Where template files belong below.