I passed the first hands-on challenge and completed the Lightning App Builder Module, But every time I try and add "Hello World" flow (created in the first challenge) to the Contact record page I get the error message; We couldn't find a Record page called "Contact Record Page".

I'd appreciate it if someone could tell me where I'm going wrong. 
 

Hello,

 

I've noted in Salesforce.com url's that querystring parameters often contain the characters %2F  before an object. What is the purpose of these characters & what do they mean?

 

An example is the following "retURL=%2F01QQ1000007E4cm"

Where "01QQ1000007E4cm" is the object id.

 

Thanking you for your help.