As per the Welcome Topic… perhaps search this forum BEFORE asking a basic question. Searching for keywords like motor, car, robot, rover, etc. will show you lots of others questions, code, examples and solutions…
Then your coding methods will need to change a bit for Blynk usage (No major code in the
void loop(), use timers instead). Start off with simple examples in the Sketch Builder and learn to walk before you drive
Then as you read others topics, the Help Center & Documents, and start learning how it all works… you can ask specific Blynk questions about your motor project here in your topic.