Vbulletin Pop-up

Can somebody please tell me how to integrate something like the popup shown below in my vBulletin? I have seen something very similar to this on digitalpoint but it showed up only one time and I can't make it on my own :(

Hi Umang,

You are not currently showing as a customer, if you recently purchased vBSEO then please send me a PM with the transaction details.

Until then I am going to close this thread as we only support questions from customers at the moment.

Thank you

Ceri