Follow steps 9,10 in the documentation here. Bolva is a relatively new brand in North America. (Hence there isn’t a known remote code).
You’ll have to scan and try to find a compatible code from another manufacturer, if one is even available.
Your only other solution is purchasing a true universal remote like a Logitech harmony. Or use two remotes, bolva for volume and power and Telus remote to control the Optik box.