Most sharing is done through Lightboxes, but you can also share a Collection. There are two ways to share a Collection. Note that the Share form only allows you to send your Collection to one email recipient at a time, so the link option may be a better choice if you have a lot of trusted recipients.
Via Quick Link
Click the name of your Collection, located in the upper right of the viewing pane
Click Edit Collection
Copy the Full or Low-Resolution Share Link from the Overview Tab
Paste the shared link where desired.
Via Secure Share Form
Click the arrow-shaped share icon to the right of the Collection name, or press Ctrl+Shift+S
Enter the email address of the recipient.
Complete any other desired sections.
Click Share when finished.