Posting here is very simple. Here is a quick step by step:

1.Pick the section of the forum you'd like to post to (there are sections dedicated to all aspects of mapping EX:regional/world mapping city/town mapping building/structure mapping etc etc...)
2. Once you find the section you are looking for click "start new thread"
3. you will see the box that you've used to type here. Click "go advanced" on the bottom
4. Type whatever you want in the box.
5. After you are done with your text hit enter at least once to move the cursor down to an "empty" section of the box.
6. On the top of the box you will see a bunch of icons. Click the one that looks like a "paperclip" this is the "Attachment" icon.
7. Once you click that a new window will open where you can upload your image.
8. Click "add files" and find your image on your computer.
9. Once you have found your image click "upload" (a note here the max file size is 5MB but try to stay a little below that)
10. Once your file is uploaded it will appear in a small box on the bottom of the attachment manager (it should have a little check mark in the corner)
11. On the bottom of the attachment manager there will be a button that says "insert inline" click that. (this is why you want your cursor in an empty space of the text box)
12. A line of code will appear that will allow your image to be displayed as a "thumbnail" and when clicked on will open a new window with the full sized image.

That's all there is to it. I hope this was helpful and I look forward to seeing your work