need help!!!

Please help me… i try to install openVPN when i type command: source ./vars i

get message "NOTE: If you run ./clean-all, I will be doing a rm -rf on /etc/openvpn/easy-rsa/2.0/keys". But when i try type command: ./build-ca get message like this

"Please edit the vars script to reflect your configuration,

then source it with "source ./vars".

Next, to start with a fresh PKI configuration and to delete any

previous certificates and keys, run "./clean-all".

Finally, you can run this tool (pkitool) to build certificates/keys"

what that mean and how to enter right command?

:( :( :(

Thank you.