Switch to enom nameservers once domain is transferred to enom

I find myself confused in what to do next. I have a domain that I transferred to enom through whmcs. nameservers are the old nameservers still in whmcs and enom. Enom shows it as "custom dns".

My goal is to have the dns hosted at enom and managed through whmcs. How do I now switch nameservers in whmcs, and tell enom to use "our dns"? If I switch nameservers in whmcs will it update enom AND setup dns? If I set it to "our nameservers" in my enom account will it update in whmcs?

I see areas to change the nameservers and manage dns, but I'm not sure that those settings update at enom.

Any ideas?

If you set the NS in Enom it will update in Whmcs and vice versa.

Thanks. I'll edit the domain in enom, set dns in whmcs and see how it goes. I just didn't want to get caught off guard with email and web outages from the dns change.