Request('id'); not working in a post method

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PHP

hey currently using laravel and what im trying to do is to get the id that is in the URL and use it to access the data in the database. But it seems that in forms it cannot be done? since I've done it in a get method.

here is the code for the controller. can someone help me with this I've been stuck here for days.

ublic function evalstudap(Request $request) {
        
        $start = $request->start;
        $end = $request->end;
        $date = $request->date;
        $message = $request->message;
        $transno = request('id');
        $user = DB::table('studapforms')->where('transno', $transno)->first();

        if(empty($start)&&empty($end)&&empty($date)&&empty($message)) {
            return redirect()->back()->with('message', "Input fields must be filled up.");
        }else {
            if($user) {
                MailController::notifeval($user->email, $start, $end, $date, $message);
                return redirect()->back()->with('emessage', "Student Has been notified");
            }else {
                return redirect()->back()->with('emessage', "error");

            }

        }

        return view('/studap/admin/evalstudap ', ['list' => $user]);
    }

What I have tried:

ive tried using different kinds of request methods but still the same