For the logo to show up on iPhone devices, pls set the retina logo in the “Theme Options > Site Logo”.
The iPhone slider can be added by using the [iphone_slider] shortcode as per the examples shown here (see code at the end of the page) –
https://www.livemeshthemes.com/appdev/smartphone-sliders/
Pls have a look at the Page section named Intro in the sample data. I would urge you to load the sample data if you have not done so already. Thanks