[ns] problem with setting environment variables

[Onyekachi]

Hello ns-users,
Please I am a new user of the ns2 simulator. I just installed it 
(ns-2.29) without setting the environment variables properly. Anytime I 
try to run a *.tcl file i get the following message: 'bash: ns: command 
not found".
Please I would appreciate a step by step approach to resolving this problem.

N/B: My ns directory is *c:/home/ns-allinone-2.29/ns-2.29*

Thanks.
Onyekachi.