Look at the request window and expand the select box with the endpoint address. You should see something like this:
/
[edit current...]
[add new endpoint...]
[delete current]
You click on [edit current...]
and you can change the value.
Here is an example using some available web service from w3schools.com:
http://www.w3schools.com/xml/tempconvert.asmx?WSDL
![Change endpoint address](https://i.stack.imgur.com/QITgC.jpg)
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