As I already said… Blynk does NOT directly control your motors, it can only control the digital pins on the ESP8266… but both the ESP (running Blynk library and some code) and your phone (running the Blynk App), need internet access to do so as they both need to communicate to a Blynk Server. (There are Local Server option, but it is advanced user level… start with the Cloud Server)
So, if you have functional Motor controller and code for it, and know what pins need to do what in order to drive a motor, then you can use Blynk to do the same thing.
There are many existing topics with examples of sketches controlling motors, robots, etc in this forum… a little searching will go a long way. Try keywords like Motor, Robot, Rover, Car, etc.