I could have told you that, if you had asked! Will remember for future reference.
Welcome again to the forum. Enjoy it. There are lots of good people here.
I believe inline pic posting is disabled, but if you click on the button of the picture (2nd row, 2nd button), then fill in the URL of your pic, it may show up.
Otherwise, you have to click on the additional options link below the message field and attach the file.