just curious i see people do it and not sure how this works

If the image is stored on your device, you first need to upload it to an image host.
The most popular one is https://imgur.com/
Once you have an image uploaded, you need its direct image url. This ends in a file extension such as .jpg, .png, .gif, etc...

To post this on the forum we use the IMG tag
Once you have an image's direct url you can paste it into your post, highlight it, and click the icon circled below located above the message box:


This puts the IMG tag around your link as such, inserting the image into your post:

Take the image url and put it inside the image brackets. It will look like this:

thank you both will find an image and try this , very informative