First of all, editing is a whole lot easier if your "what you see is what you get" editor is enabled. In the upper right of the forum, click 'Settings'...then at the left click 'General Settings'. Scroll down to where you see 'Message Editor Interface' and click the radio button beside 'Enhanced Interface - Full WYSIWYG Editing'. Click 'Save Changes' and you are good to go.
Word Wrap
Normally, when you mix text and images, the formatting doesn't work out right. For example, if you were to add an image in the middle of this paragraph, it would stretch out the wording
To have the text wrap around the image properly, simply double-click the image and the image editor will pop up. Select to align your image to the right or left and choose the image size (normally thumbnail which expands when clicked). You can also have your image link to another page.Lorem ipsum dolor sit amet, consectetur adipiscing elit. In facilisis ultrices augue, eu dictum lectus luctus non. Duis et velit faucibus, auctor nisl non, sagittis orci. Integer tincidunt nunc at lectus facilisis suscipit. Morbi cursus dictum libero. Mauris imperdiet nulla at augue dapibus, in accumsan magna hendrerit. Nulla pretium gravida quam. Aliquam interdum risus augue, ac posuere dui vulputate a. Nunc mi neque, convallis eu quam vel, tempus pellentesque massa. Maecenas ligula nisi, feugiat vitae orci nec, ullamcorper lacinia nibh. Cras porta eros non ligula blandit sodales. Morbi pretium dapibus mi, sed posuere velit commodo sit amet. Nunc placerat aliquet porttitor. Donec congue vulputate ligula vel faucibus. Fusce interdum odio a risus faucibus, ullamcorper feugiat urna euismod.
When you are done, it looks like this
Lorem ipsum dolor sit amet, consectetur adipiscing elit. In facilisis ultrices augue, eu dictum lectus luctus non. Duis et velit faucibus, auctor nisl non, sagittis orci. Integer tincidunt nunc at lectus facilisis suscipit. Morbi cursus dictum libero. Mauris imperdiet nulla at augue dapibus, in accumsan magna hendrerit. Nulla pretium gravida quam. Aliquam interdum risus augue, ac posuere dui vulputate a. Nunc mi neque, convallis eu quam vel, tempus pellentesque massa. Maecenas ligula nisi, feugiat vitae orci nec, ullamcorper lacinia nibh. Cras porta eros non ligula blandit sodales. Morbi pretium dapibus mi, sed posuere velit commodo sit amet. Nunc placerat aliquet porttitor. Donec congue vulputate ligula vel faucibus. Fusce interdum odio a risus faucibus, ullamcorper feugiat urna euismod.