Fast access to external pages & services which are related to your site. These vary depending on the needs of your administrators.
Spark location: Tools > Quick Links
click Tools in the Spark navigation and you'll find Quick Links in one of the page widgets - like you see above left.
Or, you can hover over Settings in the navigation and mouse down to the link you need and click - like you see above right.
Frequently accessed tools from this section are mailing list sign ups, custom blog integrations, Instagram authorization etc.