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.
A kitten for you!Edit
Glad that you liked the videos
Wikimedia Commons does not accept derivative works of non-free works such as File:NL-HaNA 2.24.01.05 0 933-5654.jpg. It only accepts free content, which is images and other media files that can be used by anyone, for any purpose. Reproductions of copyrighted works are also subject to the same copyright, and therefore this file must unfortunately be considered non-free. For more information, please read Commons:Derivative works and Commons:Freedom of panorama. You can ask questions about Commons policies in Commons:Help desk. The file you added has been deleted. If you believe that this file was not a derivative work of a non-free work, you may request undeletion.