1. Find a free photo hosting site e.g. Photobucket.com and sign up for a free account.
2. Using Photobucket as an example. Click on Browse... button to select a picture from your PC to upload. Once you are done with selection, click on Upload button
3. After photos are uploaded, you will see the pictures online with some code below each picture like the one shown below:
4. Click once on the Direct Link code to copy the link.
5. Add a forum post and click on Insert Image button on the editor.
6. Right-click on at the URL textbox to paste the copied image link. Then click OK button.
7. Image will be inserted.