wait statement error

First you should use the numeric_std library, to have access to the signed and unsigned types.

Then declare count and z as unsigned(1 downto 0) and unsigned(6 downto 0) respectively, and you can directly use arithmetic operators on them:

count<=count+1;
IF ((Z = 15) or (Z = 30) or (Z = 45) or (Z = 60)) then
  clkout<= not clkout;
END IF; 
IF(Z = 83) THEN
  Z <="0000000";
ELSE
  Z <=Z+1;
END IF; 

I don't understand the values you use though... do you want to divide the clock frequency by 3 (meaning 666.666kHz) or by 3000 to get 666 Hz? IF dividing by 3 you won't be able to produce a square signal with 50% duty cycle. But you can generate a clock enable signal quite easily.