Re-enable insider preview builds after previously having stopped them

Hello, just wondering, if there is a way to re-enable the Insider Preview builds after having stopped them. I am currently stuck with a buggy build after I stopped it and I feel I may not have a choice but a clean re-install. 

As of now, the below is all that is displayed under my Insider Programme settings. Is there something within the Windows registry that can be re-enable I wonder?

Thanks in advance.