Hi Melbards, welcome!
DAZ Studio has at least three ways of doing AO, the simplest being using UberEnvironment which you can find in DAZ Studio Formats->My Library->Light Presets->omnifreaker->UberEnvironment2. Double click on the !UberEnvironment2 Base (first icon) and then on any of the available image maps (or none if you want a pure-AO look).
A second way is by using Shader Mixer, which is a bit more involved. Open SM, and go to Functions->Lighting->Shadows and drag or double click on Ambient Occlusion which will spawn the AO brick in the middle of the screen. Drag its C connector to Diffuse Strength, make sure a surface you want it applied to is selected and press Apply.
A third way is with the AO point-cloud script in the render settings/Advanced, select “Scripted 3Delight” as Render Engine, then the “Point Based Occlusion” script.