To post a photo to the PRS Forums, please use an image hosting service. A popular option is Imgur.com. Below are the steps to host a photos on Imgur.com - other photo hosting sites should have a similar process.
1. Go to imgur.com and click “New Post” (or go directly to imgur.com/upload)
2. Drag and drop your image to “Drop Images Here” or “choose photo” and select the file from your computer.
3. Next to Copy Link, click the menu button and click “Get Share Links”
4. Copy the text from the BBCode (Forums) option
5. Paste into a post and you should be good!
As an Android smartphone user (vs Desktop computer user), Step 3 did not work as straight as advertised there. Here's what I found I needed to do in addition. I imagine this where most others are having problems as well.
1. You won't find (at least, I could not), the option to copy BB code for the image in the Imgur app itself. You will instead need to navigate to the Imgur website in a browser and sign in there.
2. In your browser settings, find and turn on "Desktop Site" mode. Wait for Imgur website to reload.
3. Navigate to one of the pics you've already uploaded to Imgur that you want to share in a forum post. Click on the image. Wait for the new web page to load that has details about that photo.
4. In that new details page, click in the top right corner of the image itself. Even though there is nothing there specifically that you're clicking on, I know. This was the least intuitive part of the process. Just click in the top right corner of the photo.
5. Having done that, you get a popup in the top right corner w 2 clickable choices, "Copy link" and an icon w three period characters displayed ("..."). Click the icon w three periods.
6. Now you get a new popup with a list of different codes that you can choose to copy. Scan down the list and find the one captioned "BB code". On the right side of that line, click "Copy link". Once you do, you'll get a quick shortlived msg that flashes by telling you that the link is now copied to your clipboard.
7. In your web browser, navigate to the PRS Forum and then create a new post/reply.
8. In that new reply, right-click to get your paste option and choose paste. You will see the BB Code pasted into your reply. That's it. When you save your post, that copied image will now display just fine.