I browse and post on this forum on my phone. So, Google 'ibb image' and when on home screen look at top right of phone and you'll see 3 vertical dots(on Android)
Scroll down and click 'add to home screen' and it will be saved on your phone like an app.
Long press a pic and download image. Go into ibb uploader and press 'start uploading'. Click on file and find saved image, then click 'open'(top right). Then press upload. Make sure you select 'BBCode full linked'.
Copy and paste into icon that looks like a chain link.
That's a pint you owe me MP; )