How do I undo this connector?

[Simon54]

Was changing the headlights on the Peugeot Partner and I never did manage to undo it, so I managed with the bumper in-situ, just for next time it'd be good to know how?

many thanks,
Simon.

[Pixel Pusher]

Google says:

[bangerhoarder]

Press the raised area of the yellow section down (the two ridges on the photo) then slide it out (up on the photo). The plug should then undo.