PowerPoint problem with design template

I began a PowerPoint presentation and was going along well until I used a design template to make a caption for what was coming next.
After that, when I wanted to insert the next slide, the design template came up instead. I thought maybe I could just insert the new slide on it, but when I try to insert "picture" from file it just doesn't work. How do I get rid of the "design template" out of the choice from the choices of inserts. lilart