OGG and MP3 are compression programmes that drastically reduce the size of a recording. You wouldn't dream of posting a WAV file on a forum, it is much too heavy.
To convert WAV to MP3 (and other formats, including OGG) I use dBpowerAMP Music Converter
(freeware). I suppose other programmes are available for free, but that one is very convenient.
Please bear in mind that you can only post your own recordings here.