If your TRV application is refused, there is no formal appeal process. In addition, you may only reapply if your situation has changed substantially or you have considerable new information to submit.
In addition to the application forms and required fees, you will need to submit photos, proof of financial support, a photocopy of your return ticket or travel itinerary (if applicable), and any other documents required by the visa office responsible for your country or region.
If your friend or family member requires a TRV to visit Canada, their initial application must be made outside the country, at the visa office responsible for the applicant's country or region. You may provide them with a Letter of Invitation, explaining how you will help the person to visit Canada. For example, you may state that you will pay for plane tickets or accommodation. While a Letter of Invitation may help a TRV application, it does not guarantee that the person will receive a visa.