The import reference is wrong.

Author: passion4IT

website/docs/setItem.md

@@ -18,7 +18,7 @@ Example:
 import RNSInfo from 'react-native-sensitive-info';
 
 const myFunc = async () => {
-    return SInfo.setItem('key1', 'value1', {
+    return RNSInfo.setItem('key1', 'value1', {
         sharedPreferencesName: 'mySharedPrefs',
         keychainService: 'myKeychain'
     });
@@ -39,4 +39,4 @@ But if you rather not to use it our **default** sharedPreferencesName is: **shar
 SInfo.setItem('key1', 'value1', {});
 ```
 
-If you used Android's getDefaultSharedPreferences in your project the shared preference's name that you are looking for is: **com.mypackage.MyApp_preferences**. On the other hand if you used iOS's Keychain the default service is: **app**.
+If you used Android's getDefaultSharedPreferences in your project the shared preference's name that you are looking for is: **com.mypackage.MyApp_preferences**. On the other hand if you used iOS's Keychain the default service is: **app**.