If you aren't that bothered about interspersing pictures and text – for example if you want to post a link and also include a sample shot somewhere in your post – you can always just host the pic at forumophilia.
Again, it's very easy...
Just reply as you would if you were simply posting a message. Write your post in the blank space - but before you press the Submit button, take a look at the panel just above the Preview and Submit buttons:
You will see a separate section with the instruction Add an Attachment. Immediately below that you will see a button which says Choose File. Click the Choose File button and a drop down menu will appear, showing you all the various files on your desktop:
As you open each file, you will get a list of the contents. Simply select the jpeg you want to upload by clicking on it and pressing the Choose button at the foot of the drop down menu. The drop down menu will disappear and you will see that the name of the pic you have selected now appears in the space next to the Choose File Button:
If you want to check that you are happy with how your post will look, press the Preview button, and a panel will show you what your message, including the attached pic, will look like. If you are happy, then press the Submit button and your post will be uploaded to the thread.
I know that both this system and the picture host system described above by Monkey D Ruffy seem very fiddly at first, but try posting a few pics and you'll realise that it's really very easy.