You can give other users access to your tournament, so you can manage it together.
You can grant specific sections per manager (e.g. only schedule and results, not the settings).
Yes. You add someone using the email address they already have an UwTornooi account with. If they do not have one yet, have them create one for free with that address first — after that you can add them.
Yes. When adding someone you choose which rights they get, and you can release specific sections per manager. That way you can give access to the schedule and the results without letting them touch your tournament settings.
Yes. Under Organisation › Change log you will find everything that changes in your tournament, with who did it, when and from where: via the website, the app, a referee's personal link or a participant who registered. For a score you see the old and the new result (for example 1-0 → 3-2), for a moved match the old and the new time and court. Handy if there is a discussion about a result.
You can search by name, team or action and filter by channel. Only the tournament's organiser sees this tab — co-managers do not.