Please see step 3 in the documentation 
regarding verifying your domain, particularly:

   1. Supply the domain name ("") and click *Verify*. This opens 
   up a new tab titled *Webmaster Central*.
   2. Follow the directions provided by the *Webmaster Central* tab, then 
   click *Verify*.

On Saturday, September 17, 2016 at 12:09:13 AM UTC-4, Huy Nguyen wrote:
> Dear GAE support,
> I want add new custom ssl domain for my project in GAE,
> I added domain, then i add ssl certificate but not success. Message alert 
> as image attacked,
>>  You must verify ownership of this certificate's domain(s)in order to 
>> upload it
> Ssl certificates namecheap for * 
> Although webmaster tool added website property for and 
> what happens ?

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