Just because the MyIPO hasn’t yet approved your trademark doesn’t mean you can’t fly a TM symbol proudly on your website or place of business. Legally speaking, attaching a TM symbol to your name only means that you are asserting a public claim of ownership to the trademark. It does not mean that your name has been registered by the MyIPO. Assuming that your name doesn’t infringe on any other existing trademarks or service marks then you can feel free to attach the TM symbol to it.