If you use the regular “post reply” screen, at the bottom of the screen, just above the “Preview Post” and “Submit Post” buttons you will see a little box that says “Attachements” and has a button “Choose…” next to it.
You need to know the name and location of the file on your machine, and I believe the file has to have the appropriate filetype suffix on it in order for the system to recognize what it is. Hit the choose button, and it will open up a window with your file manager, which should allow you to navigate to the desired file. When you select the file, it’s name should appear in the Attachments box.
If you only have one picture, just hit “submit post” and the picture will upload and get posted automatically. If you have multiple pictures, hit the “Preview Post” button, and you will see your post as it will appear, including the picture. If you then go to the bottom of the editing window, you can add another picture the same way, repeating as needed for each additional picture. Once you have added all the pictures be sure to hit the “Submit Post” button to actually post your message or all will be lost!
Note that there is a 250KB size limit on the pictures, I think this is total per post, not per picture. Use your favorite photo editor to crop and / or reduce the resolution on the photos as needed to get them down to a reasonable size, or use multiple messages to post one photo per message.
(At least this is how it works for me using Opera under Linux, I don’t know what those wierd proprietary O/S’s do…)
Gooserider