To set up live chat on your site, you can place the standard code from your live chat tool into the site footer code. It will automatically work across the Thinkific site, including the student course player!
If you have any questions, or if you're loving a different chat tool that you're using on your site, let us know below!
Most live chat softwares have the option to specify where the chat box appears. I took a look at Olark and it looks like you can specify whether it appears on the left or right of the window. So if you pick for it to appear on the left, it won't block the "Next" button anymore.
You may even be able to get more specific about where it appears by customising the installation script from Olark. If you reach out to their support team, they should be able to give you a hand with that.
Hope that helps.