Hey there Nibedita Mohapatra
thats a good question and thanks for using QandA platform,
Start by clicking on your profile icon in the upper right corner and choosing settings, you can connect your new account to your learning profile.
Go to 'Account Management' by scrolling down the settings screen, and then select +Add Account from the list of linked accounts.
after your new email account has been added. Enter your new account information to log into the Microsoft learning platform. Once more, navigate to your profile icon in the upper right corner and choose Settings. Go to Linked accounts by swiping down. The previous account email address can then be deleted. The new email address will be used for any future sign-ins.
If this helps kindly accept the answer thanks much.