That is where the design and content of the sign-up page are handled. Make sure when editing that you don't use double or single quotes without escaping them first. I.e.:
" is wrong but \" is right. ' is wrong but \' is right
Even though single quotes are not used in that bit, but it's good programming practice to always escape quotes when inside a string or echo/print command.
If it's a module you made, then you just change the permission to "Anonymous Users Only" or "Unregistered Users Only" or whatever it's called. Same goes if it's a block, you edit the block and make sure it's set so that only anonymous visitors can see it.
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