Hi This is the code that works with the trigger.And the response will be sent by the body but i need the  button to work

The trigger code is

trigger AccountCallout on Account (after Update) {

List<Account> AccountTest =[Select Name,Id,BillingCity from Account where type ='other'];

      for (Account Test : AccountTest ) {         // make the asynchronous web service callout         WebServiceCallout.sendNotification(Test.Name, Test.BillingCity ,Test.Id);       } }

And the apex code is below.

public class WebServiceCallout {
 
    @future (callout=true)
    public static void sendNotification(String name, String city,String Id) {
       
        HttpRequest req = new HttpRequest();
        HttpResponse res = new HttpResponse();
        Http http = new Http();
 
        req.setEndpoint('http://www.apexdevnet.com');
        req.setMethod('GET');
         //req.setBody('name='+EncodingUtil.urlEncode(name, 'UTF-8')+'&city='+EncodingUtil.urlEncode(city, 'UTF-8')+'&id='+EncodingUtil.urlEncode(Id, 'UTF-8'));
         req.setBody('name='+EncodingUtil.urlEncode(Id, 'UTF-8'));
        /* System.debug('@@@@@@@@@@@@'+name);
         System.debug('@@@@@@@@@@NAME'+name);
         System.debug('@@@@@@@@@@City'+city);
         */
         System.debug('@@@@@@@@@@IdSS'+Id);
            req.setCompressed(true); // otherwise we hit a limit of 32000
 
        try {
            res = http.send(req);
        } catch(System.CalloutException e) {
            System.debug('Callout error: '+ e);
            System.debug(res.toString());
        }
 
    }
}

On click of button i need this Apex code to be triggered .

Pl help me out .