First, uninstall the Grammarly Keyboard from your Android device:
- Go to Settings on your mobile device.
- Scroll down to the Apps menu.
- Find Grammarly in the list of apps and tap Uninstall.
Note: The instructions may differ depending on the model of your device and your Android version.
Once that's done, visit this page and click Install to download the app on your device.
When the app is installed, open it and click Get Started. If you already have a Grammarly account, tap Log in to existing account and enter your login credentials. If you don't, tap Continue with email to create an account.