The tutorial linked below will demonstrate how a user can mark an RFQ for quoting.
You can learn how to mark an RFQ for quoting by watching this video.
You will first click on an RFQ you are interested in and go to the RFQ detail page. You just need to click on the Mark for Quoting button on the RFQ detail page.
An RFQ marked for quoting will be stored in your quotes in progress folder to help you quickly navigate to that RFQ.