@Myra22, you should be able to see the prospective guest's profiles whether you have Instant Book on or not.
The only thing you don't see prior to confirming a booking is their photo and their direct contact information.
How are you trying to see their profile? Are you doing this on a computer or smart phone?
Generally I click on their picture (or not-picture) and it eventually goes to their profile. Or try "Details" or something like that. You should be able to see their profile and read their prior reviews from other hosts.
(Even without Instant Book).