You are almost done!

1. ExecCGI needs to be enabled in your Moinmoin directory. You con do this by
simply
# echo "Options ExecCGI" > ${MY_INSTALLDIR}/.htaccess

2. Add the following lines to your Apache configs:
Alias /moinmoin/ "${MY_INSTALLDIR}"
ScriptAlias /mymoin "${MY_INSTALLDIR}/moin.cgi"

3. Restart Apache

4. Go to http://YOURHOST/mymoin

Enjoy!