Convert FT232RL board from 5V to 3.3V
On the picture it looks like there is a small trace between the 5V and centre pads. If that is the case, you must cut it and apply a solder blob connecting the 3.3V and  centre pads.

I am not sure what this will do for the Vcc output pin. If it switches to 3.3V, be aware that you can draw only a very limited current from it.