Our first steps tour and our frequently asked questions will help you a lot after registration. They explain how to customize the interface (for example the language), how to upload files and our basic licensing policy (Wikimedia Commons only accepts free content). You don't need technical skills in order to contribute here. Be bold contributing here and assume good faith for the intentions of others. This is a wiki — it is really easy.
More information is available at the community portal. You may ask questions at the help desk, village pump or on IRC channel #wikimedia-commons (webchat). You can also contact an administrator on their talk page. If you have a specific copyright question, ask at the copyright village pump.
File:KMKadish.jpg has been marked as a possible copyright violation. Wikimedia Commons only accepts free content—that is, images and other media files that can be used by anyone, for any purpose. Traditional copyright law does not grant these freedoms, and unless noted otherwise, everything you find on the web is copyrighted and not permitted here. For details on what is acceptable, please read Commons:Licensing. You may also find Commons:Copyright rules useful, or you can ask questions about Commons policies at the Commons:Help desk.
File:KMKadish.jpg - copyright concerns
Regarding creative commons copyright for this image
You expressed concerns about the Photo of Dr. Kadish that was originally located on his webpage, kadishchem.uh.edu . My understanding of the copyright as listed at the bottom of the webpage was that it addressed the page itself rather than the individual elements. However, I am Dr. Kadish's assistant and currently maintaining that website - and having been requested by Dr. Kadish himself to create the Wikipedia entry, I don't think copyright of this image should be an impediment.
While I was not the original photographer, the image in question was created at the University of Houston in the Department of Chemistry IT department. Before I used the photo (as opposed to creating my own image, since I lack sufficient photographic equipment) I confirmed with the University of Houston, Department of Chemistry, IT department (my contact was Jerry Do, <jhdo@Central.UH.EDU>) that this image is, in fact, acceptable to post with unlimited (creative commons) use.
Please let me know if any additional documentation is required to make sure this image is acceptable for publication.
Thanks in advance and best regards,
Florence Snively (email@example.com or firstname.lastname@example.org)