Do you mean the Vizio D32F-F1?
For any TV, first make sure that the current input is TV. For the D32F-F1, you can use the Input button on the back of the TV; it's the one at the bottom of the control buttons. There is also an Input button on the remote. Press the left/right arrow buttons or press the Input button repeatedly to navigate to the desired source. Press OK to change to this input.
Once the input is set to TV, press the Menu button. Navigate to the Channels menu item with the arrow keys and press OK. Highlight Find Channels and press OK. The manual for the Vizio D32-F1 is available on the product page: https://www.vizio.com/tvs/d32ff1.html
. The current link to the manual is https://cdn.vizio.com/user-manual/PDF/2018/TV/D-Series_FHD_UM_ENG.pdf
I hope this helps.