Our first steps help file and our FAQ 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. 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.
Hello, and thank your for sharing your files with Commons. There seems to be a problem regarding the description and/or licensing of this particular file. Please remember that all uploads require source, author and license information. Could you please resolve these problems, which are described on the page linked in above? You can edit the description page and change the text. Uploading a new version of the file does not change the description of the file. This page may give you more hints on which information may be missing. Please note that if you won't provide a valid license in 7 days your image will be deleted and if you upload a lot of images without licenses you may be blocked from editing wikimedia-commons. Thank you.
Thank you for your contributions. Your image or other content was recently deleted, or will soon be deleted, in accordance with our process and policies, because it was not, or is not, within our scope. Please review our project scope, but in short, Commons is targeted at educational media files including photographs, diagrams, animations, music, spoken text and video clips. The expression “educational” is to be understood according to its broad meaning of “providing knowledge; instructional or informative”. Wikimedia Commons does not contain text articles like encyclopedia articles, textbooks, news, word definitions and such. Each of these other kinds of content have their own projects: Wikipedia, Wikibooks, Wikisource, Wikinews, Wiktionary and Wikiquote.
If the content seems to fit the scope of one of those other projects, please consider contributing it there. Otherwise, consider an alternative outlet. If you think that the deletion was in error because the contribution really was in scope, you can appeal it at Commons:Undeletion requests, giving a reason why it fits our scope to help others evaluate the matter. Thank you for your understanding.