HelpRealmRelay setup Help

I need help with realmrelay. It says:

Add a new line to the file, with the following text:
127.0.0.1 ec2-50-19-47-160.compute-1.amazonaws.com

Where do I add new line:

# Copyright (c) 1993-2013 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost
::1 localhost

Where do I add it???

Cause it says Make sure the file name are correct

dd a new line to the file, with the following text:
127.0.0.1 ec2-50-19-47-160.compute-1.amazonaws.com

Where do I add new line:

# Copyright (c) 1993-2013 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost
::1 localhost
(ADD THE LINE HERE)
Where do I add it???

Cause it says Make sure the file name are correct

It doesnt matter where it gets put.......you can delete EVERYTHING inside the hosts file and RealmRelay will work.......You can place it 10,000 lines down and it will still work....

Just stick it anywhere, on a NEW line with no spaces in front of it