Hello Mr Maple,
There is no established way for polyamorists to meet each other; a lot of it is random and it takes a lot of time and patience. You can try a poly dating site or app (I've heard Feeld is a good poly app), but most of those are pretty lame. Honestly I think your best bet is to just get out there and meet people. Join a club, take a class, do something that interests you, and just let platonic friendships develop naturally, don't try to force it. You can talk to a platonic friend about polyamory, without the pressure on the friend to accept. If they do accept, then you can know that if the friendship ever evolves into something romantic, you'll have already had the "poly talk" with them, and they'll have already had ample time to think about it, and draw their own conclusions. Sounds involved I know, and as I've said we're dealing with a process that could take quite a few years.
It can help if there is a fringe activity that interests you: a Ren faire, an indie concert, a kink munch, a sci-fi convention ... something along those lines. The people you meet at a fringe event are more likely to either be poly, or at least be open-minded about poly. Another approach is to look for a poly group (with poly meetups) in your area. Google "Kelowna polyamory," or "British Columbia polyamory," or "Vancouver polyamory," something to that effect. One or two poly groups may pop up. Just, when you go to a poly meetup, don't start hitting on people. Again, let platonic friendships form naturally, and have hope that something platonic may eventually lead to something romantic. Whatever route you take, be ready to be patient, as it could take a few years at least.
My current partner and I met in 1995, we were both monogamous at the time and the context was we met at church via choir practice. We were both married. We were just friends for the next ten years, and we lost contact with each other for maybe five years. We finally met up (by pure chance) at another church, and the two of us found ourselves working together. We started exchanging emails, and little by little, the emails became deeper, longer, and more personal. It was 2005, and we found ourselves falling in love with each other. We had to work that out with our spouses, and that took about a year and wasn't easy, we needed our spouses to consent to a polyamorous arrangement. Long story short, we were able to be with each other polyamorously starting in 2006. That's the very abbreviated version of my story.
Hopefully that helps,