You can adjust the temperature level on your Wave by using the light bar or the Embr Wave app.
Using the light bar, press and hold the blue side (for cooling) or the red side (for warming) for 5-10 seconds or until it reaches your desired temperature level. The light bar will flash blue or red when it's reached the maximum available level of cooling or warming.
Using the app, tap and hold the blue side (for cooling) or the red side (for warming) of the light bar underneath the temperature dial:
You'll see the temperature level move along the dial as you hold or tap on the light bar: