Hi, thanks for helping and apologies for late reply,
Yes I do, it's
https://talk-it.net, but if I try to specify a custom domain via 'Your Own Domain' under 'Change Domain Name', I get the error message 'Your domain name currently resolves to an IP address that doesn't belong to Nabble. ...'
Other info:
The embedding code currently includes this link -
http://talk-it-forum.549.s1.nabble.com, but this doesn't embed the forum, it merely shows a link to it.
I've made a CNAME record that points to s1.nabble