The easiest way to embed images in your posts are to use an external hosting site like www.imgur.com/upload, then insert the BBCode in your posts like this:
(https://i.imgur.com/KoXZPEo.png)
(https://i.imgur.com/2js1au6.png)
The BBCode looks something like this
[img]https://i.imgur.com/2js1au6.png[/img]