我可以使用sitelock3d彩吧论坛券进行现有订阅吗？
通常，siterock3d彩吧论坛券适用于新用户，不能应用于现有订阅。
for most cases, only 1 coupon can be used for each new sitelock subscription. the sitelock checkout page doesn't usually allow more than 1 code to be applied at the same time.