To add the danb35 repository, run the following command:

* for NS7

yum install https://repo.familybrown.org/nethserver/7/noarch/nethserver-danb35-1.0.0-6.ns7.noarch.rpm

Then you have to enable it first if you want to install rpms, for example

yum install nethserver-automx --enablerepo=danb35

and for update

yum update --enablerepo=danb35