Editing a shop page_Astra Theme

I am new to WordPress and have managed to get most of my pages nearly ok but I can’t work out how to edit my shop page, i only have one product at the moment and I want to edit the image position, text and background. I have instructions to go to Appearance_Customise_Woocommerce_and there I should find options to customise like background colour, and moving text but these options are not showing.

The page I need help with: [log in to see the link]