I use tapatalk and there is a button for it above the keyboard. I believe tapatalk is hosting it. Otherwise you’re going to have to host it someplace and use an html snippet in your post. A lot of the image hosting places will generate that for you.
Its a pain but here's how I've been able to do it.
After picture is uploaded , click the blue hyperlink
The attached file (picture) should open in a new window
Copy the url
Click the Insert Image button
Copy and Paste URL