1- No smoking
2 - This is a western toilet, please don't squat on the toilet.
3 - I'm really not sure what this is all about....maybe don't wash your feet with the hose (In Asian bathrooms they have a hose with a spray nozzle on it, you know like the old school ones we have in kitchen sinks in America)
4 - Don't use the hose to take a shower
Banteay Kdei was built in the late 12th to early 13th Century.