To save from the Primo results page, first click the ... menu button, then select the RefWorks icon.
You may also save to RefWorks if you've already opened up details about a source by going to the Actions menu at the bottom of the page for that source.
You'll be taken to a screen that asks you to select the version of RefWorks you would like to export to. Choose Export to the new RefWorks.
Note that you are able to check the Don't ask me again button to export to new RefWorks automatically in the future.