Black, posting images is easy but if your image is from the 'net, that's the simplest way.
Go to the page where the image is.
Right click on the image and select SAVE IMAGE LOCATION
Come to the forum here, on the thread page where you want to post the image
Click on the little rectangular icon up there in orange, that looks like a photo of a sun and mountain in a frame. If you hover your mouse over it, it says INSERT IMAGE and some other stuff.
You will see this appear: (img)(/img), just in square brackets, not round ones.
The cursor will automatically be between the two parentheses, ready for you to either right click and hit PASTE, or hit CTRL-V
The link to the image is now ready to view if you opt to hit the PREVIEW button on your post, or you can just hit the SUBMIT button.
If the image you want is on your home computer or phone, you'll have to do something different.
I am used to using a great free image host program called GYAZO
https://gyazo.com/ but there are plenty of other sites out there that do the same thing in more or less the same way.
They will 'take a snapshot' of a photo you have open on your PC, and create an URL for it, which you can access by the process above (right click, copy image location, paste here after clicking the INSERT IMAGE link.
If I'm telling you how to suck eggs, and you already knew this, apologies, but if something's not working for you in trying to upload pics, let us know and someone will know how to solve it.
Shazz