I can't personalize the invitation on my smartphone. Most smartphones have a built-in PDF reader, but you will need to open the invitation on a PC to be able to personalize the invitation and print it or otherwise distribute it.
I clicked the link and it doesn't seem like anything happened. The Invitation is a 2MB file; it may take up to 20 seconds display, depending the speed of your internet connection.
I'm on my PC and I still can't personalize the invitation. Depending on which browser you are using, you may need to download the document before editing it. Look for an icon that looks something like this:
If you still feel like the invitation is not working correctly please update Adobe Acrobat Reader