It seems that you are having some issues with your SlingPlayer since it does not show the right remote control skin for your Humax TiVo.
I recommend you to check if the Humax TiVo model you are using is included on the supported devices list. Just check this link in order to find out.
If it is, I recommend you to run one more time the TV Input configuration and select the specific make and model for your TiVo.
If not, you can check this thread posted by alanrichey42.