not all installations have an externall box so the cable ends you have are possibly VM - there should be an internal box to house an isolator but that looks as though it might have been removed - the isolator protects the circuit and cnverts the female input to male to connect to the cable
you can try adding an F type barrel connector to allow you to connect the cable - screwfix - B & Q or similar sell them for about a £1 - if you do that make sure you use the cable supplied with the self install kit which has an isolator in it
if it works then you need to activate it and thats it
if it does not work or you are not happy to do that then book a tech
____________________
Tony