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Krishna,Go through with the below links.https://help.salesforce.com/articleView?id=managing_packages.htm&type=0 (https://help.salesforce.com/articleView?id=managing_packages.htm&type=0" target="_blank)https://help.salesforce.com/articleView?id=sharing_apps.htm&type=0 (https://help.salesforce.com/articleView?id=sharing_apps.htm&type=0" target="_blank)Follow the below steps.1 - Setup -> Create -> Packages -> Edit2 - Click on Continue Button, Enter the namespace that you would like to use for the package in "Namespace Prefix" and then click on Check availability. If you got the message name space is availabe then click on "Review My Selection" button.3 - Click on "Save" button.Please let me know if this helps :)Thanks!Amit Singh.