Help needed with Client/Server Comunication

This is the issue that i have at the moment, and i'm getting very frustrated about this.

I have this code in my login server application:

 public void RequestAccountRegister(string id, string password, string email, string clientIp, int accessLevel)
 {
     
     string INSERT_ACCOUNT_VALUES = @"INSERT INTO accounts (id, password, email, clientIp, accessLevel) VALUES ('" + id + "','" + password + "','" + email + "','" + clientIp + "','" + accessLevel +"')";
     
     MySqlConnection Connection = new MySqlConnection(LoginConfigLoader.getConString());
     Connection.Open();
     MySqlCommand Command = new MySqlCommand(INSERT_ACCOUNT_VALUES, Connection);
     Command.Prepare();
     Command.ExecuteNonQuery();
     Debug.LogWarning("Recieved New Account Registration."); 
 }

My problem is that how can i make that void Request from my Client?

So it would be like:

THIS IS CLIENT : RequestAccountRegister(variables)

Thank's in advance, any help will be greatly appreciated.