As long as you have a V2 or V3 hub with uptodate firmware, it is automatically ready for Edge. The WiFi mesh model “Connect Home” unfortunately doesn’t support edge yet. 
Smartthings Edge and code/hw requirements
After that, see the community FAQ. As. @Mariano_Colmenarejo said, basically you find the forum thread for the driver you want to use, then follow the link there to subscribe to that channel. The FAQ has more details.
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)
One of the goals for Edge was to make it much simpler for customers to install than DTHs, and I think they succeeded at that. 