Slide

Hi Maud, Thank you for your post, welcome to the forum, in answer to your question;
To insert a slide, if you wish to insert a New slide Next, then you can click on the New Slide button on the Formatting toolbar, or from the menu command choose Insert>New Slide, or simply use the keyboard command CTRL+M.
If you wish to insert a new slide in an existing presentation in the side bar which displays either thumbnails or Outline views of your slides, select the slide below which you wish your new slide to appear and again follow the steps above.
You then have the choice to select from the Text or Content Layout thumbnails on the right had side of the screen.
I hope this has helped, if so, please click the Resolved link, best regards Pete