You can change the section title by editing the 'Heading' field. This is just plain text, so can't include any bold or italic text.
You can add an unlimited amount of logos, all with optional links. Each block has the option for a link, which can be to any page/product within your site, or any external link. To enter an external link, add the full address, i.e. 'http://www.shopify.com'