Help for burp collaborator

Hi guys,

I need some help. In some days i started the webacademy portswigger and them I have some problems for solve this lab .

I cant Place the Burp Collaborator payload into a malicious DTD file:

<!ENTITY % eval "">


I dont know how I can put this payload from the collaborator server answer the client. If someone cold explain how can i do this I will be very happy.


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