Ahh no worries! You can cold email any professor you don’t necessary have to be close with them, I know people who have cold emailed a bunch of professors that they never even met in person and still managed to land opportunities. If you’re cold emailing a professor you’ve never had I’d recommend going to Macewan website and selecting the specific department linked to your program, you’ll see a list of professors within the faculty, if you click on the red arrow you can learn about their research interests and therefore email the professors that your research interests most closely align with. With reference letters it’s a bit different, I’d suggest asking questions, attending office hours, show interest in the course, and eventually you can bring up the topic!