Channel Manager & Tax

Hi there,

I've just created my account and did the set up. It is asking me to link my account to a Channel Manager. I am not using any so I would like to know if I have to choose one anyway? Will it change something to my account on Booking? In this case, which one would you recommend me to use?

Also, I saw that you put that the price shown doesn't include taxes but we do include the taxes in our prices. I couldn't find any where where to change it.Could you please help me out?