There’s a guide here:
https://discuss.eroscripts.com/t/how-to-connect-your-147-sex-toys-including-the-handy-fleshlight-launch-kiiroo-keon-or-onyx-for-interactive-2d-and-vr-step-by-step-guide/8275/97
and
https://discuss.eroscripts.com/t/how-to-use-scripts-in-vr-picture-guide/20477
Basically, you connect to the SLR website in DeoVR and enter your connection key, and then you should be able to play via DeoVR