@IBAction func nextButton(_ sender: Any) {
   ...
   ...
    } else if (counter == 3) {

        let url = URL(string: "http://myserver.com/signup.php")!
        var request = URLRequest(url: url)
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        request.httpMethod = "POST"
        let postString = "fname=(firstName)&lname=(lastName)&username=(username)&email=(email)&phone=(phone)&country=(country)&password=(password)"
        request.httpBody = postString.data(using: .utf8)
        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {                                                 // check for fundamental networking error
                print("error=(String(describing: error))")
                return
            }

            if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
                print("statusCode should be 200, but is (httpStatus.statusCode)")
                print("response = (String(describing: response))")
            }

            let responseString = String(data: data, encoding: .utf8)
            print("responseString = (String(describing: responseString))")
        }
        task.resume()

    }