To speak to one of my customer service team on live chat, first go to the Help popup at the bottom right of the screen:
On some devices you'll just see this:
Search for the question you'd like answered in the 'how can we help' field.
If that doesn't give you the results you're looking for, after you search a 'Live chat' button will appear at the bottom left of the screen:
Click 'Live chat' to speak to an agent.