Since my computer decided to not accept the memory stick (my mac is hanging in there but its 7 years old and for some reason that isn't working despite everything else). I have an iPad mini which I use to take the picture (I'm sure you could do the same with an iPhone or other mobile phone as well. I don't have a lot of memory on my phone so I started using the iPad). if you have an iPhone you could take the photos from it and you should be able to get your "Photo stream" on any other Apple devices you have as long as the iCloud drive is open on the device.
Check the iPad settings to make sure that the iCloud drive is "on. And that "My Photo Stream" is also on.
Download the photobucket app from the App Store and open it. You will probably have to log on to Photobucket.
Tap on the three bars in the top left corner. Tap on Your Library. Choose the album you want (or your Bucket if you don't have different albums). Choose the photo you want. Tapon the iCloud icon at the bottom of the page. The Camera Roll, Photo Stream or Cloud Album if you have one appear, Click on either Camera Roll or Photo Stream , choose the photo(s) you want to upload, and tap on Upload.
To send to the forum, Choose the photo you want to send. Tap on the "i" from the choices on the bottom of the screen. 4 links appear. Tap on the IMG link and then copy that link to your forum post.
Sounds a lot more complicated than it is. Took me a while to figure out the steps, but it really goes very quickly once you know the steps. I don't think I left any out. Sorry about your computer.
I keep expecting mine to go soon, but
it will last a while longer.