Changing Heating times channelplus h37xl

Hi,

We have a channelplus h37xl white thermostat box, this is to program our hot water and underfloor heating.

Just wondering, if anyone was kind enough to advice, on how to change the heating times using this box.

Unfortunately there isn't many buttons, i.e some buttons double as two functions, on the machine. To makes things worse, the instructions are pretty complex for us. If somebody could explain help me understand how to use this i would be very grateful.

Thanks in advance for any help.