Computer.
Many modern words (computer, teenager, etc) are the same in English and in German.
Computer PC (PAY-tsay) Rechner
the plural in German is "Knöpfe" (alternativ if you need to write the word on a computer without the "ö"-button, than it's written "Knoepfe")
If you open an English to German translation dictionary, you may look for what an English word means in German, and visa versa. It is the same in computer translating programs. The computer searches through a vast database, and gives up the translation. If the word is not in the database, then the search will fail.
"Am Computer"
Chre is not a German word
It stays the same - Computer is Computer.
"mit" is the German word for "with".
The word FROM in German is von
The word for is in German - " ist "
The German word for he is er.
The German word for their is "Ihre."
The German word for "Who" is "Wer".