When you see the list of results in Discovery, select the items that you want to add to your Zotero Library by selecting the blue folder on the right hand side of the result (NOTE: When you select the blue folder, the folder icon will then turn yellow as per the image below. This indicates that the item has been saved to your folder).
If you wish, you can select the folder you would like your results to go into at this stage.
Select OK, and the references will go straight into your account.
If it doesn’t automatically open Zotero, against the ‘Open with’ option, select the drop down arrow against ‘Research Soft Direct Export Helper’ and find the program ‘Zotero’.
If your items are imported into Zotero standalone, you will need to synchronise with the Zotero server to make sure your new records go into all of your Zotero applications.