Glitch on my game

[smexhy]

Thanks Silver and everyone for your time! luckily i fixed all the bugs by myself .
I have a question about programming in general:
So i have this readln(key) .
and it := 'F' for example.
and if i say
if (key = 'F') and (variable > 0) then begin
-syntax-
end;
it wont work like this... it will just jump to the other task even if i tell it
else if (variable > 0) then begin
writeln('You don have the enough variable');
how is this a fix?
If you don't understand me ill just post the code and you guys will see about what im talking ;\