Its very easy!
Go to your dashboard. To the left click on edit profile. The third option is to Show my email address. Make sure that box has a check in it! THEN, scroll ALL the way to the bottom and click SAVE PROFILE. Now, go view your profile and make sure that the word EMAIL is to the left of your profile!
If you want to create a new email JUST for blogging, go do that. Then under edit profile, go down to where it says Identity and change your email Address.
If you have any questions, please let me know!