the small phrase "go ahead" hello everyone, I always listen the small phrase "go ahead do blablabla..", how do I say the phrase correctly?

My First Introduction Hello! My name is Hsing Min Chien. Someday I discovered the website that can acquaint a lot of foreign friends, and I hoped I can improve my English Communication from here. I really adored who can speak English fluently people, but the people were not the native American. I'm Taiwanese! Taiwan education for English was very tedious, and they highlighted the grammer, not speaking and communication; I recited even myriad of vocabularies, but I can't improve my English skill. Because of the tedious Taiwan English Courses that I can't understand how to use those vocabularies. My complaint has finished, probably I can acquaint many foreign, and we can get an interaction between English and Mandarin(Chinese) :P, Oh! I forgot introduce something, I'm 24 years old.