The old Lifecycle equipment offers three different profiles: hill, random, and manual. Level 1 in difficulty on manual corresponds to 2 on random, and 3 on hill, etc. Hill is the easiest for beginners.
The Lifecycle is calibrated to ride smoothest at 80 RPM, so you are not making it easy on yourself to go slower than the recommendation. This is also true of many other exercise bikes. The recommended rpm will give you the smoothest ride and the best workout.