Tumblr won't let me customise my blog

I have been having trouble customizing my Tumblr blog because whenever I try to view it (not in dashboard mode), it keeps redirecting me to the dashboard. When I go to edit theme to make changes, the preview is blank until I make edits to the description or something else. Does anyone know how to fix this so I can edit my blog (not the dashboard) as intended?

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Is your blog currently set to display just to logged-in users? I encountered the same problem, and it came out that you can only customise the blog if it is visible to everyone, even if they are not logged into Tumblr.