How do I change my Tumblr theme?

I want to make my Tumblr theme set up for a comic Im making, so you can start at the beginning and click next, previous, first, last, ect. But I cant

I want to make my Tumblr theme set up for a comic I'm making, so you can start at the beginning and click next, previous, first, last, ect. But I can't figure out how to do it. I know I need to be on the customization page, but then I need to turn on “Comic Pagination” and I don't know what that is or how to turn it on. Please help I just want to post my comic in a nice format.

or:I want to make my Tumblr theme set up for a comic I'm making, so you can start at the beginning and click next, previous, first, last, ect. But I can't figure out how to do it. I know I need to be on the customization page, but then I need to turn on \u201cComic Pagination\u201d and I don't know what that is or how to turn it on. Please help I just want to post my comic in a nice format.

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