Please post code that can be copied/pasted, not images.
AxesLabel has x for the x axis label what is the value of x? Should it be "x"? The k subscript theta does not look right.
Try to work with smaller expressions and test them before trying Manipulate.
func[k_, t_] := ...
func[-30, 0]
func[30, 16]
Plot[func[k, 8], {k, -30, 30}]
Plot[func[-5, t], {t, 0, 16}]