In case your cPanel password is not accepted, you can try resetting it.
If you are a SiteGround customer, log in your Customer's area and there will be a link "Manage" next to your account. Follow this link and there will be an option to change your cPanel password.
Then try logging in cPanel with the new password and there will be no problems.
cPanel is easy to work with when you have the right host to support you. If you need a reliable partner to help you manage your website with cPanel, check out our cPanel hosting services!