There is a method in the file class to read an array of characters from the file. Reading and sending characters in bunches is orders of magnitude faster then sending packets containing one character apiece, as you are doing.
It is not at all clear what help you need. You've posted an incorrectly formatted link to a web site, so that the link doesn't work. You've posted a ridiculously long source dump of the page, requiring is to cut and paste it back together if we cared enough.
That page is unnecessarily complicated, with style shits and java scripting. It's hard to pick out what you are really trying to show the user.
You've incorrectly posted code.
What you haven't done is said what the problem is.
What I am trying to do is so when the alarm goes off
What alarm?
he motor in the arduino moves.
Simple enough. Send a GET request with appropriate data.
However I dont know how to send commands from the website
See above.
I'd use a much less complicated web page, with a form and one or more submit buttons that automatically generate a new GET request.
You can do it however you want, but this doesn't really seem like an Arduino problem. It's more like you don't know how to make your page generate a new GET request. I can't help you with that. It's far to complicated a mess for me to understand.