Yes. Always ask to register a member account first, then log in to pay for member upgrade automatically.

Yes. When you use real email to sign up for an account, that email will receive a confirmation when the account upgrade is successful. In addition, when you need support from the admin, it is easy to determine the status of your account.

You can send a message at the Contact page, if you are already a paid member, log in to contact us via a separate form for paid members (also at the contact page)

Firstly, remember to write down the password and paste right next to the screen to avoid forgetting errors, typing wrong (repeated wrong entries will be locked within 15 minutes)

If you've forgotten your password, send a password request to your receive payment email (nl*******ung@yahoo.com). Required information is: username and email. Administrators will only re-issue password to paid member (please enter your correct registered email)

Normally the system will automatically upgrade members, but there are probabilities of error. If you have successful payment and you are still logged in as a free member after 10 minutes, the best way is to send an email to the receive payment email (nl*******ung@yahoo.com) included information: transaction ID, username, email. The administrator will upgrade your account as soon as possible.
Forgive if this is the rare case!

Both Chrome and FireFox browsers have developer tool: Ignore X-Frame-Options. If you are using one of the two browsers above and you get this error, try adding this gadget to the browser:

-https://addons.mozilla.org/en-US/firefox/addon/ignore-x-frame-options-header/
-https://chrome.google.com/webstore/detail/ignore-x-frame-headers/gleekbfjekiniecknbkamfmkohkpodhe

In other case: The refused to connect error may due to the wrong password, you need to wait for 30 minutes and then log back in

No, e-book file isn’t stamped (no watermark) and can be printable after being downloaded

Before logging in and paying for membership upgrades, you need to know that there are a lot of documents you can download or use online (which is what you see / hear when you are not a member). Please use the search feature when downloading as well as browsing the site to get the most results.
However, there are no available guarantees for all that you are looking for. So please consider carefully before making payment so you don't have to complain later.
The following note should be emphasized: The above resources are classified into 3 functional groups:
1-Online (Use online); 2-Download (Downloadable) and 3-Projector (use online but with clean content, no stamp, no watermark)
Because these 3 functional subgroups are independent, it is impossible to guarantee the same number in all 3 groups at the same time. The update speed is different so the number will increase but not evenly.
If you still cannot find what you are looking for, please send an administrator support request, for instructions on how to search or update manually on a specific request.