To use your headset, simply switch to webVR mode.
Roundme is originally designed to be compatible with the most of VR devices and we don't have a list of recommended devices.
Still we constantly work optimizing Roundme webVR mode to be used with different devices. In the webVR settings you can find the list of device templates. If your device is not on the list yet, we recommend you to test it with the existing templates.
Cardboard templates are the most universal options and it would be a good idea to start with one of them.