Translation of Hektik

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.
Maybe we would need to say install our dictionary as a software? But I would say instead of install, use our dictionary as a software. So bottom line. If I use the singular form for newsletters and websites, I am on the safe side for both?
Do you like Hamburg? I've never been there. Maybe I can visit it one day. I hope to hear from you and please write me in German, so that you will also learn it. Do not worry about mistakes.