Technical nearside wiper

[Jahe]

Hi all,
help needed for the un educated self.
nearside wiper not working although off side is, any ideas what the prob could be,
a

 

[Davren]

Will be a loose nut that holds the wiper arm to the spindle or the linkage has broken or fallen off under the scuttle panel.

 

[Jahe]

thanks for the response,
now how do i go about checkin what the prob is