To use the template you like, access the subsite this template will be used in. Open the new tab at the top of the page then select page...
Fill in the blanks to create new page. Name will be the URL name and Title is the name display in the tab in the browser then press next. Select any custom properties you would like.
Press save to continue, prev to go back to the name and cancel to end without saving the page. The template is now ready to be use just edit each element to add your information.
If you do not know how to do this please select the responsive element tab to the right to learn how to use each element.