The way you posted your images they are accessed via a hyperlink. Try directly uploading them to the forum, as an attachment using the paperclip icon in the message editor. I have done just that with a copy of your first image below.
Best
JA
P.S: While this works, it would be better if it were possible to see the images at fully open width limited only by the width of the message, without having to click on the image. On another audio forum I used to frequent, with the same I think forum software, hyperlinks such as those you posted would be visible within messages just as you'd posted. I think it's only a matter of the way that things are configured in the forum software. Anyway we at least have a workaround.