Create a channel in the web ui: Channels -> Manage Channels -> Create Software Channel

Channel Name*: EPEL for Red Hat Enterprise Linux 6
Channel Label*: epel_rhel6_x86_64
Parent Channel: Red Hat Enterprise Linux Server (v. 6 for 64-bit x86_64) 
Parent Channel Architecture: x86_64
Yum Repository Checksum Type: sha1
Channel Summary*: EPEL Repository


Create a new repo in the web ui: Channels -> Manage Repositories -> Create new repository

Repository Label*   epel_repo_rhel6_x86_64
Repository URL*     http://mirrors.kernel.org/fedora-epel/6Server/x86_64/


Sync the repo from the command line

spacewalk-repo-sync -c epel_rhel6_x86_64 -u http://mirrors.kernel.org/fedora-epel/6Server/x86_64/


Clients will need to have the key for epel. In snippets  add something like

rpm --import https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-6