There is a community-created project that gives you a nicely formatted web interface to your account, if that’s of any help:
SmartThings API Browser+ ... Now Available to All
If you prefer to use the official feature, you have to use the “advanced“ page in the official web interface:
Also, there’s a Community FAQ about edge Drivers, that might clear up some of the confusion:
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)
Or, if you just want a short explanation, there’s a Community FAQ just on the process of changing from one edge driver to another: