To completely disassociate two blogs currently registered to the same username we register another username with a different email address, while we are logged out of WordPress.com. Then we add the new username as an Admin to the blog we want to transfer to that username, and use this process to transfer the blog to a new username account.
Thereafter you will have to link the appropriate blog to each username. Here’s how to link your username to your blog in your blog Dashboard -> Users -> Personal Settings -> then scroll down to Account Details. Then scroll down to where it says ‘Website‘ select the URL for your primary wordpress.com blog and then save changes.
Now every time you sign into the forum we can all click on your username and your blog will be linked to it. And every time you leave a comment on a blog your username can be likewise clicked and your blog can be instantly located.