RoscoeD I’m selecting nothing yet only one star seems to be guiding.
To make sure you don't accidentally choose the one star case, don't touch the tablet except for the vertical column of button icons on the right.
Start by tapping the icon to start sampliing. Second icon down that looks like two arrowed arcs chasing each other's tail.
Wait about 3 to 4 times your exposure time. Then tap on guiding, third icon down, that looks like a target scope.
Do you have an especially bright star in the FOV of the guide camera? If so, the other stars may be too dim to get selected.
If so, increase the gain of the guide camera by 10 dB to 20 dB (add 100 to 200 to the ZWO gain units). This will bring up the dimmer stars, while saturating (and thus ignoring) the brightest star(s).
Chen