From the dashboard:
Click "Events" in the leftmost navigation menu.
Find and click into the event you'd like to send a proposal for.
Visit the "documents" tab (beneath the event name at the top of your screen).
Click your completed and published proposal to enter the proposal editor page.
From the "Proposal Editor" page:
Click "Share" in the top right corner.
Click "Share Link" and the url is "copied" and ready to be pasted!
Paste this link into the body of an email addressed to your client to share their live proposal with them!
They can click the link you've shared to access this live proposal for their reference and records.