The phrase "to use the trademark" means to actively and legally utilize a specific brand name, logo, or symbol to represent and distinguish a product or service from others in the marketplace. Full definition
And if you don't use the trademark in a period of three years, you can lose ownership of it. (canadianbusiness.com)
First if you are a REALTOR quit using their trademarks in an illegal way no other member is allowed to use. (remonline.com)
In contrast, a section 20 infringement action allows a registered owner of a trademark to prevent others from using trademarks or trade names that are confusing with the registered trademark. (lklaw.ca)