All images added to this wiki must be "free-use". That is, they must either by public domain or licensed by the copyright holder under a licence that allows anyone to reuse the images. It's important that we do not add images taken from other websites as these are usually not free-use and would be copyright violations. See Help:Image copyright tags for more detail on licences and how to tag your images.
To upload images you must be logged in.
Click on "Upload file" in the toolbox on the left (under the search boxes)
The "Browse" button lets you find the image on your hard drive. Click "open" to select the file.
If you want to change the file name, you can do so in the "Destination filename" box.