Adding Image to Discussion.

When I click on Add image in a post, I get "", I am confused about how to use this.

You would use it in the following way ![this is alt text](https://url/to/the/image)

Thanks that works to add an image from the internet.
Is there any extension that allows uploading images from my device?

https://discuss.flarum.org/d/18491-imgur-upload-simple-image-upload-from-the-editor

Thanks a lot. That worked.

Can we configure its dimensions in markdown ?