Change your password from Settings → Profile, or open /auth/forgot-password. Sign out is on Profile and ends this session on this device.
Change your password
Open Settings → Profile.
In Security, select Change password. That opens /auth/update-password.
If you do not remember the current password, select Forgot password. That opens /auth/forgot-password.
Security says "Update the password for your email sign-in." If you signed up with a social provider, it says "This account signs in with a social provider. Password change is not available." There is then no Change password button.
Sign out
The Session section says "End this session on this device." Select Sign out.
Sign out does not pause campaigns, delete senders, or turn on the kill switch. Other teammates stay signed in. To halt sending for everyone, Owner or admin uses the kill switch on Settings → General. Signing out on this device does not cancel Business or free any sender seat.