You do not have the right user role to contribute viewpoints.
Start a new viewpoint by uploading an audio file. After uploading, you cannot change a viewpoint's audio file, but you can start a new viewpoint.
Recording audio, here, is easy.
However, quality can be hit and miss, particularly on older and cheaper cellphones. Consider using the built-in voice memo app for iPhones, or a dedicated app for Android. Afterwards, you can upload your recording to Placecloud.