This is your landing page, but it is not your first slide. There is an empty first slide created for you and a link to it below which starts the presentation.
The landing page should be set up for people to look at while they are waiting for you to start. You can delete the text here and put your own in. You can also use a picture to link to the first slide.
Here, also, is a link to a page of instructions. You can also get to this page from the All pages area to the left.