can I alot more space for iPhoto on my disc

dottwork,

how is your internal disk currently allotted? By default, the disk is formatted as a single partition; if that hasn’t been changed, then there’s nothing that could be increased, since the entire disk is currently allotted. If that’s the case, then you’d need to either replace your internal disk with one of larger capacity, or purchase an external disk to hold your photos, or delete some photos to make room for others.

iPhoto uses as much space as it requires and you have available. There's nothing for you to do there.

Why do you want to do this?