As you might have noticed, the Myrlyn version 0.9.7 released with Leap 16.0 does not yet have community repos like PackMan, NVidia, Open H.264, LibDvdCss: Those repos did not exist yet on the (mostly non-SUSE) servers that host them.
After those repos were created and published in the servers, I added them to Myrlyn (v 0.9.9) with them, but so far I was unable to release that version for Leap 16.0 because the discussion and work around Leap 16.0 updates has still been ongoing.
Please notice that this is a temporary workaround; it simply downloads one specific version and installs it without adding that repo. Once it’s in the official Leap 16.0 update repos, please use the one from there.
There is a tab similar to the “Repositories” tab if there are any services (or if you start Myrlyn with the --force-service-view command line option, but so far there is nothing to add/edit/remove a service.
When it became obvious that Leap 16.0 would have a RIS, I was wondering if it would be worthwhile to basically replicate the whole repos management, and I decided against it: I don’t think any openSUSE distro will ever have more than one RIS, and if it has one, you will probably want to stick with it.
For those who really need it, there is still zypper. But this is a much more uncommon operation than managing repos IMHO. I don’t see a use case.