Pat:
You can a copy of the marriage record from the General Register office for around 4 euros. See instructions below.
I can't help you with where they lived after they married since the latest census available is 1911.
Check the 1911 census www.census.nationalarchives.ie There were 13 William McGrane records in Dublin and most of them were younger. Not sure how you will know which one is the one who married Elizabeth.
Roger
Go to this link http://www.welfare.ie/en/Pages/Apply-for-Certificates.aspx In the middle of the page there are links for birth, marriage or death certificates. Hit the link for the form you want. Print the form and complete the requested information. Also provide the information from the index record--quarter/year of the event. registration district and the volume and page number where the event is recorded. Make sure you ask for a copy which costs around 4 euros. ( A cert costs closer to 20 euros). You can also ask the GRO to e-mail the copy back to you.