Here are a few screenshots detailing how to add images to forum posts.
If possible, please try to link to images, rather the embed. Some ideas on how to do so are here:
If you have to embed, please follow the instructions below:
Click on the Attach Images (Choose Files) button. This will open a dialog that allows you to select the files on your computer. Please note that maximum file size is 1000KB.
This will add a small thumbnail of your image(s).
Move you cursor to where you want the image to appear in your post. Click the "Add to Post" text on the bottom right.
This will add the text linking to your image. When you click "Post New Topic", the image will appear in your post.
Any problems, please let me know!