how to set path after instalation of NS2.34 in Ubuntu 11.10

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Ubuntu

hi everyone after installing Ns2.34 in Ubuntu 11.10, i have found follow steps, i dont know how and where to set path, and how to perform following steps, please suggest me a solution,,


<i> Please put /home/tassi/Desktop/NS-Installation/ns-allinone-2.34/bin:/home/tassi/Desktop/NS-Installation/ns-allinone-2.34/tcl8.4.18/unix:/home/tassi/Desktop/NS-Installation/ns-allinone-2.34/tk8.4.18/unix
into your PATH environment; so that you'll be able to run itm/tclsh/wish/xgraph.

IMPORTANT NOTICES:

(1) You MUST put /home/tassi/Desktop/NS-Installation/ns-allinone-2.34/otcl-1.13, /home/tassi/Desktop/NS-Installation/ns-allinone-2.34/lib,
into your LD_LIBRARY_PATH environment variable.
If it complains about X libraries, add path to your X libraries
into LD_LIBRARY_PATH.
If you are using csh, you can set it like:
setenv LD_LIBRARY_PATH <paths>
If you are using sh, you can set it like:
export LD_LIBRARY_PATH=<paths>

(2) You MUST put /home/tassi/Desktop/NS-Installation/ns-allinone-2.34/tcl8.4.18/library into your TCL_LIBRARY environmental
variable. Otherwise ns/nam will complain during startup.


After these steps, you can now run the ns validation suite with
cd ns-2.34; ./validate</i>


Thanx in advance,,, :)