You need the servers files to fix that. An I'm assuming you don't. So just wait for him and tell him the info I gave above.
Did you fix your settings.yml?
You should only upload this to your web server if you know...
It has nothing to do with the externalurl fix. That is your server.
The milkAdmin download?
milkAdmin plugin download......
To get the MilkAdmin interface to work again follow these instructions...
1. Navigate to plugins>milkadmin.
2. Open settings.yml in a code editor....
Ok done still can't build.
You haven't configured permissions yet read on how to configure it.
No one on my server can build not even ops/admins...
Ok I got a problem nobody on my server can build except ops. Heres my permissions code.
# AntiBuild is included with this. To disable a group...
Separate names with a comma.