I'll admit, adding photos to IHeartGardening is not so easy. I'll be working on a direct and simple method for including photos in the future. For now, follow these steps.
1. While writing a forum post, click on the icon to the left of the smiley face. That accesses a dialog box to your photo gallery. Every user has a gallery by default.

2. Then navigate to your username and you'll likely see an empty gallery at first. Here's mine with photos already in it.

3. Click on "Add photo" near the bottom right corner and up pops another dialog.

4. Browse to your photo on your computer and select it. The photo will automatically begin uploading.

5. Then, you should see a thumbnail of your photo. Click once on it to highlight it and select a couple other options for the size of the image you want displayed. The images shown right in this post are size "small". There are smaller sizes for thumbnail and larger ones up to the original sized image. I personally like "medium" since it nicely fills the forum width. The other selectable option is to specify what happens when a user clicks on the image in the forum post. I specify that the click takes the user to the original size image.

Hope this helps. I will be looking for a better more direct way of including images soon.
Patrick