If you are not sure on how to install a apk into your device you will need to youtube it.
For example "how to install apk on firestick using downloader"
Here is a guide for firesticks -
https://www.firesticktricks.com/sideload-apps-on-firestick.html
APK Downloader Url and downloader short codes ( Most popular 1 and 2)
1- (Hive tivimate) https://aftv.news/632931 or downloader code 632931
2- (Hive - iMPlayer 2.8) https://aftv.news/380483 or downloader code 380483
3 - (Hive smarters) https://bit.ly/hiveSMapp or downloader code 626647
4 - (Hive nextv) https://aftv.news/328427 or code dL code 328427
After you install the app - Load Playlist - Scan QR code -
Enter in user and pass - Wait for app to load data - Done
