Open the Themes app on your OPPO phone
Sign in with your OPPO account if prompted
Browse themes, wallpapers, fonts, and ringtones
Tap the theme you want
Tap Download
Tap Apply after the download finishes
Open Settings if you want to change the theme later
Go to Home screen and wallpaper
Tap Themes
Select a downloaded theme and apply it
Use the search bar in the Themes app to find specific themes
Make sure your phone is connected to the internet
Update the Themes app if themes are not loading
Check whether your region supports the Themes store
Restart your phone if the app is not working
Use a third-party launcher if the built-in Themes app is unavailable