How to retrieve a token from a site, and use it in a POST method

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Hello, here is what I am trying to do:

I want to get a token called "X-CSRF-TOKEN" from the following URL: "http://www.roblox.com/home" using Roblox.XsrfToken.setToken('') I am guessing I would need to parse the website to get it, I tried

 var token = Roblox.XsrfToken.setToken('') 
token.href = "http://www.roblox.com/My/GroupAdmin.aspx"

I am not sure if I am going the right way with that, however once I have the token I need to make a POST to "http://www.roblox.com/groups/api/change-member-rank"

$.ajax({
      type: "POST",
      url: "http://www.roblox.com/groups/api/change-member-rank"
      data: {
          X-CSRF-TOKEN: [The token]
          X-Requested-With: XMLHttpRequest

            }
});

?
with the variables groupId, newRoleSetId, and targetUserId and pass the "X-CSRF-TOKEN" from what we just got above, along with "X-Requested-With: XMLHttpRequest" to the url /My/GroupAdmin.aspx I put above. I think I also need to pass a cookie with this?

What I am trying to do here is create an automated system that promotes users of this website in a group or clan, and I know this is possible as I have seen multiple others do it, however they did not seem to want to tell me how to do it, and the information I gave you is what I have been figuring out myself.

When I make the POST the legitimate way, this is the information that is returned:

POST /groups/api/change-member-rank?groupId=1190045&newRoleSetId=7835958&targetUserId=563473 HTTP/1.1
Host: www.roblox.com
Connection: keep-alive
Content-Length: 0
Accept: */*
Origin: http://www.roblox.com
X-CSRF-TOKEN: pJLkcw7TXHlV
X-Requested-With: XMLHttpRequest

If you have anymore questions, please ask.