How do I change team numbers of teams already signed up for events?

Hi, I have to change some team numbers for teams that already signed up to builds, is that possible? Is it possible to delete build signups for a specific team as well, instead of all of them.

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Tips: right click, you can perform more tasks, such as inserting emoji, checking spelling, etc. If you copy text from Word or other sources, make sure to 'Paste as plain text' after right-clicking, otherwise, lots of unnecessary formatting attributes will be imported.