What is the most logical next event?

How to change your tumblr name
Change your blog name only if you are sure that you are ok with changing the url on your tumblr account.
All links to the former name will be broken. If you share blogs a lot, you may want to consider simply adding secondary blogs in place of a name change.

Select from:
(1). Search for a potentially known url. For example, maybe you know that you eat ice cream from your diet..
(2). Decide on the name you want to use in place of your old name. Add a secondary blog to your newly named tumblr account if you want to retain the old blog name..
(3). For example, rather than adding your first and last name in your blog, add your blog name here. You may need to enter your desired blog url twice and use a plus sign to add 4 letters to your blog..
(4). This is particularly the case with blog url names you don't want to share with others. Using the subname you already use on your blog instead of your original words will complete the change and give you a better chance of being able to change your name..
(2).