The signal does not hold its value outside clock edge

Please help me with an error in my code.

I need that when a button is pressed, the signal changes its value. But the quartus says he can not infer a register for it.

I found a resolution, which is here:http://quartushelp.altera.com/14.0/mergedprojects/msgs/msgs/evrfx_vhdl_is_not_synthesizable_since_it_does_not_hold_its_value.htm .

But I do not know the reset utility there. Only need the button.

Thank you.

Code:

    accept_seconds: PROCESS(enable,data) --processo de aceitar ou não os segundos inseridos. 
    BEGIN
--        IF(enable='0') THEN
            IF(FALLING_EDGE(enable)) THEN
                IF(data>="000000" AND data<="111011") THEN
                    tempoutput <= '1';
                    tempsave <= '1';
                ELSE
                    tempoutput <= '0';
                    tempsave <= '0';
                END IF;
--            END IF;
        ELSE
            tempsave <= '0';
        END IF;