Stop whatsapp from connecting to internet in symbian s60v3 and above phones

hey friends as we all know that whatsapp is always connected to the net and drains out our battry n data as well in symbian phones. Their is option to stop whatsapp in android phones but not in symbian.
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So today i will give a tut on how to stop whatsapp from connecting to the internet all the time.  
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for this first download this sofrwere named "jbak task manager" from below attachment:

Attachment:
Jbak task manager
Size: 207.21 kb

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Now follow below steps
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1: Open jbak task manager

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2: there u will see the list of running apps including whatsapp now click on menu then click on "program rules"
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3: now scrool below and mark "kill by memory clean" 
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4: now tap ok after that exit once then reopen jbak task manager and chk that clean by memory is marked or not if its marked then ok. After that click menu then click on
."tools"

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5: now click on memory clean u will see memory clean option on number 8
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Thats it now when ever u want to close whatsapp open jbak then click tools then memory clean and ur whatsapp will be closed.