Contact your current domain registrar and modify the DNS or Nameservers to point to the following:
ns1.bluehost.com
ns2.bluehost.com
NOTE: AFTER MODIFYING NAMESERVERS, YOU MUST WAIT AT LEAST 24 HOURS, THEN REATTEMPT TO ADDON YOUR DOMAIN
OPTION 2:
Please contact your current registrar and obtain your domain's EPP code. Once you have the EPP code, login to cPanel and attempt to addon your domain once more(this will fail). Once the attempt to addon fails, enter the EPP code and click the button entitled "VALIDATE EPP CODE". After validating your EPP Code, you can just close the domain transfer window or go back a page in your browser(You do not need to transfer the domain to us as your Registrar if you prefer not to). Now, back on the Addon Domains page, click the button "INSTALL ANYWAY" and follow the instructions provided on that page.
If you have tried both of the options above, please provide, in detail, how you tried to add your domain, and what messages or errors were displayed as a result.
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我不知道该怎么办,请大家帮忙,谢谢