It is a requirement for all users making a file upload or download to accept the Terms and Conditions. This is to ensure that other users can make use of the material - but that direct copying (for profit) of any submitted content - is prohibited. If you have any doubts or reservations about having your work commented, even criticized - then please consider carefully if you should post material. The Wiki environment can be 'robust' in its treatment of material. It is a strength of the platform - but it is not for everyone!
In order to make an upload, simply select "Upload File" from the navigation menu, select the local file, and upload. Please take the time to categorize and append summary information to the upload, and in the case of iterative code examples, make sure that any version information is made clear.
Also please make sure that the Resource Type is also filled in - as this will make it easier to locate media and content - once the Wiki has grown.