There’s a device handler written specifically for the Fibaro Roller Shutter 2 available in the thread linked below. However, if you want to try the method discussed in the post you replied to, you can change the handler used for any device by logging in to account.smartthings.com, clicking My Devices, clicking on the device, clicking Edit, and then choosing another device handler from the drop down list for Type. Note that community created device handlers like the one linked below won’t be in that list until you manually add them.