There's really not much to do other than run the basic example from the library, as is. No code changes should be needed. This is no different than what the BME280 primary guide has you do here:
Once the Adafruit BME280 library is installed, open the example in the Arduino IDE:
File->Examples->Adafruit_BME280->bme280test
and upload the sketch to the board. The output in the Serial Monitor should look like this:
