vowsnow on "Help to superscript ® in a Blog Title of Default Theme"

Apologies for double posting – I was admonished for posting in the “wrong” support forum.

I self host a WP.com blog. I have managed to customise the header image for the Default WordPress Theme. http://www.vowsnow.com.au/blog
Is there any way to superscript ® in a Blog Title Text of Default Theme? When I use the ® symbol as part of the blog title it is too large compared to the other letters in the title, I want it superscripted.
I own the registered trademark for “Get Just Married®”.
So far I have put the ® symbol into the image on the header, but I wonder if instead the symbol can be made smaller JUST for the symbol within the blog title text?
Where would I make these changes? Is it in the dashboard?

Thanks.

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