Verb conjugation of "enlist" in English

The picture I sent yesterday was taken on the first evening. And this morning the email bounced back. The user has already uploaded 3 different pictures of himself, all with the same facial expressions.
I had a few problems with my Mac. I guess I will have to buy a new one in the near future. I have already found the right product, and I will soon order it from the local hardware dealer.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.