From the message posted above:
Your user name and password can't be managed inside Jive because they're controlled by an external identity provider, such as LDAP or Active Directory. Please contact your administrator for help.
it appears this is not managed by your Jive instance, and instead, by an external LDAP/SAML system. As such, I would suggest reaching out to your IT team as a next step, as they will most likely be able to assist in resetting your password.