1. ID's you can find under Media > Library section. Please hover on the image and in the bottom, you will see the link to image where ID is. More details about Gallery shortcode you can read on https://codex.wordpress.org/Gallery_Shortcode
2. Please send us url to page where you want to change subheader size.
This is not subheader, but section. And image is not full width because is only 1240px width. So or you will upload larger image (1920px width - FULL HD) or use below css but please remember that css would be applied for all sections:
.section { background-size: cover !important; }
But this empty space in the top is Content Padding. You can remove it by activating Content | Remove Padding option under Theme options > Global > Advanced section.
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Comments
1. ID's you can find under Media > Library section. Please hover on the image and in the bottom, you will see the link to image where ID is. More details about Gallery shortcode you can read on https://codex.wordpress.org/Gallery_Shortcode
2. Please send us url to page where you want to change subheader size.