If the search query is processed, in the right side panel inside of Frase there's the SERP where you can add 'People Also Ask' questions or edit the sources (the top 20 Google results for the search query by default) via the multi-bar icon.
Any content from the sources can be cited quickly by clicking the header of a source, and clicking the paste button next to the text you wish to add. The text will be added to the editor with a link citing its source.