Editing songs is done in the editor of Drum.run. There you can chnange the song to meet your needs. You can change the title, the speed modification of the tab, and of course the drums the song consits of.
To change the title of the song, just click on the pencil next to the current name. Then enter the new name and save your changes.
The speed-modification lets you increase the speed of the played song. By default it's set to 0. Changing it to 10 will result in a much quicker played song.
The heart of the song are the notes. They can be edited by using the editor part of the page. In the 'New tact' section you can create a sequence of a song by clicking on the rows that each represent one drum of the set. The song will play from left to right. So if you click on the basedrum and the hihat in the first column and add the tact to your song, these will be played together in the first moment of the song. Just experiment with it to really get into it.