The builder holds everything on another server until you publish, so it never placed files on your account. Since you have not published your site, there is nothing on your account to delete in order to use the WordPress program.
Feel free to go ahead and install the WordPress using the Fantastico tool from your cpanel!
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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