1) Installing an app: With the watch and phone connected, in the Zepp app, go to Device > Amazfit Active 2 NFC(Round) > App Store, select a new app to download and install or update an installed app to the latest version.
2) Deleting an app: Keep your watch connected to your phone. Open the Zepp app, go to Device > Amazfit Active 2 NFC(Round) > App Store, tap Mine, tap More> Delete, select apps you want and then delete them.