Hi @minow1,
Thank you for your question and welcome to the Bunnings Workshop community, it is fabulous to have you with us.
Do you have a photo of the window lock that you can share? This will help our members offer their best advice. Let me know if you need a hand uploading images, I'm happy to help if required.
I can't say I'm familiar with the window lock you are referring to, but I imagine there will be a screw somewhere between the lock and the window frame. It could be concealed by a clip-on cover so inspect the lock unit for any seams that could indicate a cover can come off.
Once you locate the screw, it will be a simple case of removing the screw.
Once you've uploaded some photos, I'd be happy to help further if required.
Jacob
