How to read the SOAP response for a value?

when running SOAPui, I send a request and the server makes a sessionID, which is a bunch of letters and numbers about 20 chars.

After running requests i have to finish by sending a close command with the session ID number. Ive tried by inserting a property transfer step and following an example, it says to launch a wizard to let me choose the element i want to listen for? maybe thats in the PRO version, not the plain one. i put the wsdl ? http address, then tried to address the variable name; when i run the step it returns null.

in the RESPONSE it has

                                <somexml.name> 
                                      <some other field>
                                           <another field>
                                               <sessionID>AB987654321234CDEF123</sessionID>

when the step runs, i want to grab the sessionID and put it into a variable/property i created in the higher level part of the project. How is sessionID addressed?

thanks!