Hi
You have named your 'TTimer' Timer1 and it is part of the Form1
To access the timer call it by it's name ie
Timer1.enabled:=false;
Your procedure does not look to be part of the form , so to call it in this procedure you will also have to tell it where the timer1 is ie
procedure dosomething;
begin
Form1.Timer1.enabled:=false;
end;