Here's the easiest way I've found to insert pictures or images into your forum posts:
First things first...1) Please scale your pictures down! If they're too big they'll either not load or will clog the forum's capacity.
I use Microsoft Paint to scale mine.
Just open your picture in Paint.
Select Resize.
In the window that pops up, change the Vertical option to 50%. The horizontal option will automatically change with it. Repeat as needed until the image is roughly somewhere between 3"x3" up to 5"x5" in Paint. That's a  pretty good size for the forum. Pictures don't have to be square, though.
Then save it as a JPEG, for uploading to Imgur.

2) Open an Imgur account (FREE): https://imgur.com/

3) To upload your picture or image to your new Imgur account. Click on Add Images

4) Open your cropped image and hit the Copy button next to Direct Link.




5) In your forum post click on the Insert Image Icon (to the right of the YouTube Icon)




6) Paste the Direct Link information into the Image Properties box.

7) Click OK. That's it...Done.

8) Repeat as needed.

It's a breeze after the first time. Really.

If you have any difficulties or questions, please post here or email: NJ2N@arrl.net
If worst comes to worst, I may be able to upload them into your post for you.

Have fun!
73

Tim
NJ2N

PS: I originally tried this with Flickr, but they shrank all my images to the point that they were useless.