As the uploader (and therefore, owner) of any media in Vidigami, you, and you alone, have the ability to add credit to your media.
To do so, simply open any media, and add a relevant title to the Copyright field.
Typically, this is where you would put an individual's name or the name of a business (i.e. your school name).
Please note that copyright can automatically be applied to an image uploaded to Vidigami if that feature has been enabled for the file in a software prior to upload (e.g. Adobe Lightroom).