Step 1: install the olark script to your website (click here)
Step 2: enjoy the integration!
If the ActiveDEMAND script is on your website, there is nothing you need to do. ActiveDEMAND automatically detects Olark, and scrapes all conversations, inserts the conversations into timelines. As well, AD will detect email addresses embedded in the conversations ... and associate the email address with the visitor/chatter. Thus you do not need to require an email address on the form that starts the chat. If you operators ask for the email address ... AD will get it automatically from the conversation!
This gives the chat operator the AD link to the contact. Usually it will be displayed in the Olark chat window automatically anyway.