Hi,
ok firt of all in the page print [wysija_page], and I don't know the reason.
My step was:
1. active default Wordpres theme "Twenty Sixteen";
2. deactive the all plugin but not MailPoet Newsletters;
3. i found the step of this video: https://www.youtube.com/watch?v=OUAulHjtBnA
Nothing: I found print always [wysija_page]
...may you help me?