Sure, and it’s pretty simple.
You need to get an account at MB (musicbrainz.org) and sign in. You can then add things in MB directly or use the “Submit to MB” in Jaikoz. If you use Jaikoz you’ll have all the info uploaded automatically, so fill out as much as you can beforehand.
You need to find sources to ensure your info is correct. Try Amazon.com, allmusic.com, discogs.com, lastfm.com, or the actual CD in you hand. Once you sign in, you can see other people’s edits, and there’s a ton of them, and see how they put stuff in. Later you’ll get into voting where you double-check their entries.
Try it out, fill out as much as you can in Jaikoz and “Submit new Release”, then MB does a step 1, step 2, step 3 kinda thing where is asks for more info or “are you sure”, and you put your sources in at the end and hit Save. If you get it wrong, you (or someone else) can fix it.