Supercharger locations open to non Tesla vehicles are shown in the Tesla app. Activation of a Supercharger for non Tesla is by using the app.
A Supercharger Membership for non Tesla vehicles is $9.99 mth and gives non Tesla vehicles same prices as Tesla vehicles.
Some Superchargers have tap to pay credit card terminals. If you use tap to pay it will be at non Tesla prices.
More information on using Tesla superchargers and signing up for membership is on the Tesla website here
https://www.tesla.com/en_au/support/charging/supercharging-other-evs#supercharging-membership
The Tesla app, or the map on the Tesla website will show location of Superchargers open to non Tesla EVs. After you open the map, use the filter to select Other EV under Superchargers https://www.tesla.com/en_au/findus?bounds=-1.7903633671642891%2C-150.67685866365974%2C-49.116952666535006%2C85.30946946134026
