Contact
One address, read by the person who can actually change the site: hello@dailyspellingbee.com.
An answer is wrong
This is the most useful email you can send. Say which puzzle and which date, and it gets fixed the same day. Answers are fetched automatically each morning, so a wrong one usually means a publisher changed a format and the parser needs updating — that affects everyone until someone says so.
Rights and takedowns
If you hold rights in a puzzle covered here and want something changed or removed, write to the same address and it will be dealt with promptly. Daily Spelling Bee is an independent fan resource with no affiliation to any puzzle publisher, and publishes answers rather than reproductions of the puzzles themselves.
Advertising and everything else
Also the same address. There is no form here because a form would need somewhere to store what you typed, and not storing it is simpler and more private for both of us.