Hello,
Provide us with FTP access to your site. We’ll check the Continue reading link appearance.
You need to use additional plugin to add credit card payment method. Use Stripe for example.
If you just want to add the image to that area you can use WooCommerce hook https://www.businessbloomer.com/woocommerce-visual-hook-guide-checkout-page/ for example woocommerce_review_order_before_submit and add anything you need there using your child theme.
Regards