Same as what they use to login to the admin.
On the logo there is a little arrow that will dropdown for a partner account and a link will be there to go to the partner portal
You can contact live chat through the support link or the button here: BC Status
But if you want to go under the wing of a partner with a bit more support, we are always welcoming people and helping them with BC, digital marketing etc and we can get issues solved quickly through BC - You can drop brett AT prettydigital.com.au an email.