First download and install cool dog music software.

2

Turn on cool dog music. Then click "le cool".

three

Then you can see the "CRBT" option.

four

Click on CRBT. Enter your favorite CRBT name in the search box on the right. You can also choose from the recommended color ring options below.

five

Click on the name of the song, and then you can listen to the color ring back tones. Enter your mobile phone number and verification code, click to get the verification code, and the mobile phone will receive a verification code short message, enter the verification code of the short message, and click OK to set the color ring back tone.