How can I remotlychange screen lock password

Screen lock passwords/patterns are always local to the given device, as such they can’t be remotely accessible. A server or service password is a different story.

Bottom line you need access to the device and you need to remember the password/pattern needed to unlock the phone.

While you cannot remotely change the screen lock password most devices do support remotely locking them until (hopefully) physical access is restored and you can manually reset the password on the device. One of the unique things about Samsung's version of this is that when you remotely lock a device you can also set a new Pin to use when you do recover the device. This is a single use Pin so it is not exactly the solution you are requesting but might help depending on your specific use case. Below is the step by step guide on Samsung's website on how to do this (you do need to have this device registered to your Samsung account and it has to be be on and connected to a network).

https://www.samsung.com/latin_en/support...