Hello Mrs SelfPub,
Using 1 Credit to view the index wouldn't really give you much more information than you already have. To find the full birth/death date & names of both parents, including mother's maiden name, you would need to use a further 5 Credits to view the Birth or Death Certificate. ie, 6 Credits per Certificate. 'aghadowey' is right. £7 for 30 Credits and you would be viewing scans of the original Certificates, not transcriptions.
Regards, Dod.
Added. Good, I see someone has posted about the 20 Free Credits.