You can order the key ring in the app by heading to the Wearable section, selecting the Order sub-tab (top right), and then selecting MuchBetter Keyring.
The wearable costs CAD 17.99 (or the equivalent in another currency).
If you haven't verified your documents yet, you will be asked to do so at that point.
Once the verification is complete, return to the Devices tab and request the keyring.
It generally takes about 5-10 working days to arrive, but delivery to some provinces in Canada could be delayed due to extreme weather conditions or similar.
Once you have received your fob, you need to activate it in the app. Just log in and go to Wearables -> My Wearables. Tap "Activate wearable" and follow the instructions displayed in the app.
*this article is specific to MB cards and wearables for customers in Canada only.