Changing your password for the Presentations 2Go videoserver depends on the authentication configuration of the videoserver. When the videoserver is connected via LDAP/SAML/Active Directory/CONEXT/Social media the passwords are not stored in the videoserver. In that case, your password is often connected to your email account.
Only in the case of a local account configuration you can change your password in the videoserver.
How to check? Well sign-in to your videoserver, and click on your accountname in the upper right corner.
Now you should see "change password". Simply cclick on change password and proceed.