Can't Set SOAP Wsse Header

I started new project and I need to use php soap client to retrieve info from server. My problem is I cant set the security header. I would like to know how I can set the right soap security header, what things I need to pay attention to and what data I need to know to be able to set header.
Another issue is that I have soap ui file of the project, but Im not able to open it in SoapUI it gives error: WSDLException (at /con:soapui-settings): faultCode=INVALID_WSDL: Expected element ‘{http://schemas.xmlsoap.org/wsdl/}definitions’.

The wsdl file is: wsdl file

This is piece of code from soap ui file which gives info for authentication

<con:wssContainer>
<con:outgoing>
<con:name>out</con:name>
<con:entry type="Username" username="some_username" password="some_password">
<con:configuration>
<addCreated>false</addCreated>
<addNonce>false</addNonce>
<passwordType>PasswordText</passwordType>
</con:configuration>
</con:entry>
</con:outgoing>
</con:wssContainer>