Looks like it may be possible. Log in to your account, click on account settings and you get a drop down menu, click contact information. You will see your name, phone number and email. The bottom two boxes say new password and confirm password. I did not actually test it I just viewed it. Give it a shot.
If you are referring to the password to access the PDF files on your computer/device, it is embedded in the file permanently. Changing the password on the Website will not change it in the downloaded files. You may be able to change your password on the site and then download the file(s) again; that might change it in the new file. Try it.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
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