You may update your Sub-Reseller's Profile Details by following the below mentioned process:
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Login to your Reseller Control Panel. See details 
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Go to Sub-Resellers -> Search and search for the Sub-Reseller based on one of the search fields available. 
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From the list, click the Name link of the Sub-Reseller you are looking for. 
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In the Sub-Reseller Details view that follows, click the Modify button. 
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Here, you can modify the Sub-Reseller's Profile Details. 
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Click the Modify button to submit the changes. 
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This process allows you to modify your Sub-Reseller's Email Address (Username of his Control Panel) if the existing Email Address is no longer in use or your Sub-Reseller has lost control over it. 
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The Personal Identification Number (PIN) of your Sub-Reseller cannot be modified. 
