There are two ways to select a template once your are in the template selection menu.

1. Click on the radio button under the template thumbnail you would like to use.

Each thumbnail has a section below it containing the template name and a radio button with the text 'Select' next to it.

Click the radio button under the template you would like to choose. A green dot should appear in the middle of the button confirming your selection.

Lastly, click on Enter Content into Template  to proceed with editing your template.

2.  Click directly onto the thumbnail of template you would like to use.

You can preview templates by clicking directly on the thumbnails. A preview of the template will pop-up in a new window. 

At the top of the template preview window you will have the option to use that template or return to the initial template selection menu.

Also note that you can view more templates by clicking on Next Templates, and organize them by theme using the Template Categories drop down menu centered at the top of the page.