This site will allow you to upload a picture to the site and have it stored for furture viewing. First thing to know is that there is a limit of 4mb per photo. So, if your picture is larger than that, you need to resize it. if you don't know how to do that, for Windows, there's a handy utility here www.bricelam.net/ImageResizer/ - for Mac's there's a handy guide here support.apple.com/en-gb/guide/preview/prvw2015/mac
So, assuming you now have the image (in JPG format - not raw) and you want to post it up here. Start a new thread or open a reply box. Enter any text you want. Then, click the up arrow shown at the top of the data entry window here:
Find the file you want to upload from the dialogue box that appears and press OK (or Enter) to get it uploaded.
That will upload your picture. Now you need to show it. You will see a picture like the one below appear.
You need to click on the little square icon. That embeds a thumbnail of your picture wherever the cursor is when you click it.
And that's it. Click on "Start Thread" or "Post Reply" and your picture is uploaded. If someone clicks on the thumbnail, the full sized image is displayed in a new tab.