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Once you enable plg_content_rssfactory from the Plugin Manager page of Joomla you will be able to use the Content Plugin similar to this:
{com_rssfactory relevantStories nrFeeds=[3]}
The format used for tokens is this: tokenName=[value1, value2, value3]
In the example shown above "relevantStories" and "nrFeeds" are token names while "3" is the value, in this case representing the number of feeds to be displayed.
Here is a list of the available tokens that can be used:
{com_rssfactory nrFeeds=[3] searchTerm=[sport,tennis,nadal]}
Displays stories from 3 feeds that contain one of the search terms: "sport", "tennis" or "nadal", you could use
{com_rssfactory nrFeeds=[1] nrStories=[1] relevantStories }