Under pursure

I got an another work in the Taco Bell. My job is standing behind the counter.Like a casher to help customer order their meal. This is my first time to do this job and very difficult to me to remember the name of menu, because almost the name of menu are using Spain language. Moreover, almost customer are from south america. In the beginning, I always lose order and the computer system of menu is very complexity. And my boss is a woman who came from TW. But she doing work is first. So I always to point out the mistakes from her.I am onder pursure by my job recently.