1. I don't think there is any such link to it. Let's see what others have to say.
2. If you have completed Level 1 & Level 2, you will have to attend "The Anaplan Way" Classroom training. Get in touch with Anaplan Business Partner, he might be able to help you. Note: It's a paid service.
For 1., I originally did the procedure suggested by Sorna Raja Prabhu. I have my certificate but I understand from the answers that, unfortunately, there is no public link that I can show on my Linkedin profile. Issue solved then.
For 2., how do I get in touch with Anaplan Business Partners ?