求英语大神帮忙！谢谢！

dear sir and madam,
i am writing to you about volunteering at the library .i am interested in computrs and teaching ,and i want to volunteer as a computer teacher for people who lock computer skills . i love working with computers and i am good at explaning how to use new software to younger students at my school .ive taught my grandparents how to use email ang word procescing software . i like to help people to enjoy compuers as much as i do ,so i think id be good at this job . i want to help out as a volunteer at your library because know that many people go there to use your computers. i am free to help on weekends and sometimes in the evenings.
yours,truly cindy

I am writing to you about volunteering at the library. I want to volunteer as a computer teacher for people who lack computer skill. I love working computers and I'm good at explaining how to use new software to younger students at my school. I've taught my grandparent how to use---email and watch Tv online.