In order to edit the PLAY VIDEO button of the slider, please go to Dashboard > Slider Revolution > Band 

Next, click on the button layer:

Click on the eye icon to enable the youtube link settings (as soon as you're ready, you have to re-click the icon)

Click on the camera image, then you can edit the youtube ID in the right column:

Edit the social icons' links

Click on each text layer, next locate the Actions button from the Layer options menu: 

Here you can edit the link's URL, interaction, action type, link target, etc.