Here are two pictures. One is of my Samsung Galaxy Note 8. At the lower left, on the border of the device itself is the menu / options menu button.
GalaxyNote8.jpg
This one is a screen capture from another device, which doesn't have a physical options menu. In the upper right are the three stacked gray boxes.
OptionsIcon.png
...tap either of those, and you'll get a pop-up menu. One of the options in that popup menu is "Settings". If you don't see that, something is wrong in the universe. What version of Android are you running? What version of Gospel Library? (The app store or Android settings > Application Manager should tell you the version.)
Liz