Let me guide you through the basics of this site.
First of all you need a Spotify account and the Spotify application.
Play songs
Browse the site and click the play button next to a song, The Spotify application will start playing the song right away.

Post a song
You have to register to be able to post.
Found a song in Spotify you want to share? Right click the song and choose Copy Spotify URI.

Now go back to SpotiDJ, and paste the Spotify URI and click ADD.

The website will show artist and title and if you are okay with this, click the orange Add button.

Add some text to explain why you like this song and why not add a link to the artist page, a fan page, whatever.

The song will appear in the All DJ section and your personal Station. (My Station).
Nice Track!
Registered users can let other DJs know they like a particular song. Click "Nice Track!" and we will send this DJ an email.

Repost
Would you like to post a song again with your own comment? Click repost.

Add to Favorites
This will add this song to your personal list of Favorite Tracks so you can build your own collection.

Add a DJ to your Favorites
Click the avatar or name of a DJ to visit his/her personal station.
Do you like the music this DJ is playing? Add this DJ to your Favorite DJs by clicking the Add to Favorite DJs button

Now every new post by this DJ will appear on your Favorite DJs page.
Mark more DJs as a favorite and your Favorite DJ page will become a mix of songs you may like.
Problems or questions?
I hope you can figure out the rest of the features yourself. Should you have have any problems or questions let me know via the Feedback button.
Hans Handgraaf
SpotiDJ.com