Change the text of the default listing text

I have a paid listing and free listing option on my site. When you click add a free listing the following text appears
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Add Listing
Once you have completed the options below your new listing will be created but will not go live until payment has been received. This gives you time to check, modify and preview the listing before payment.
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The thing is, there is no payment that has to be made because it is a free listing. My question is where exactly do I go in the admin section to change this text.

Thanks very much.