To let the community help you, you should give more detail about the problem, like error, if you are admin, if company user or personal user and so on.
The following articles should help:
https://support.atlassian.com/confluence-cloud/docs/change-your-confluence-password/
https://support.atlassian.com/atlassian-account/docs/password-reset-issues/
I hope it helps
Regards
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