You can share a resource by hovering over the Tools icon (appears as three vertical dots) on the right-hand side of the resource of interest in the full result list.
You can also share a source if you have clicked on the title and are viewing its entry by using the Share icon. The Share icon appears as a right pointing arrow on the right-hand side just above the source title.
There are several ways to share including via email, OneDrive, Google Drive, or by creating a direct permalink. Using the share feature will forward the OneSearch entry to the recipient and not the source itself.