Audacity is a free audio recording and editing software system for use on computers of all sorts .. laptops, desktops, tablets etc …
Audacity is a resource I use nearly everyday for recording and editing sound for audio broadcasts, podcasts, video etc.
It is based on open source software, so is free, there are lots of developers and web designers who can support you (but it is so easy you’ll probably never need support of any kind).
To install it just search on Google for Audacity (or go to http://audacity.sourceforge.net/ ). To convert your audio to a MP3 recording you will need to also download LAME which is also open source and free. A link to LAME is provided on the Audacity download pages