The specific steps to set the background music of QQ space for free are as follows:

The materials we need to prepare are: computer and QQ space.

1. First, we open QQ space and click on the "Background Music" option.

2. Then we click the "Add Internet Background Music" option on this page.

3. Then we copy the link obtained from Baidu Music to the input box of the corresponding link on this page, and then enter the music name and singer name.

4. Finally, after we add background music, the qq background music setting is successful, and then reopen qq, it will automatically play the qq background music.