Can someone tell me how to delete sequences and loop a song with Audacity?

[Golden Hawk²]

So i'd like to inplant my own music on Blockland, but I need informations on how to loop and delete sequences of songs to do that, thanks.

[Ad Bot]

[Doomonkey]

The song should loop automatically in Blockland. The most important part of making a loop is either ending and starting with the same type of sound, so it just seems to go on forever. Or you should fade in and out at the beginning and end.