Greetings Mm, welcome to the Forum

In posting a Picture...

Look up at the top of the Reply Screen, second line, and find the Box titled "Insert Image". That appears when you hover your Cursor over the little image.
Click on that, and you'll see a small screen open.
Then, you'll see where there is a Highlighted part of the text line.
I usually just delete that, and insert the whole link from your Photo storage provider.
Then, click on "OK", and that image will be placed in your Post.
You can do this repeatedly if you want, and preview it by clicking on "Preview Post", before you actually enter the post.

Have a good Day !
S.W.