The registration confirmation email is plain text, you cannot send a link in a plain text email.
It is configured to be a plain text email to lessen the chance of the email being caught in a spam filter. HTML emails are more likely to be flagged as spam then plain text emails.
A lot of email clients will convert the URL in the plain text email to be click able, some however will not.
you could edit the WA_Universal_Email\Email_Templates\verification.php change line 9:
<?php echo($WAGLOBAL_Root_URL); ?>users_Confirm.php?ID=<?php echo($row_WAATKusers['UserID']); ?>&code=<?php echo($row_WAATKusers['UserVerificationCode']); ?>
to:
<a href="<?php echo($WAGLOBAL_Root_URL); ?>users_Confirm.php?ID=<?php echo($row_WAATKusers['UserID']); ?>&code=<?php echo($row_WAATKusers['UserVerificationCode']); ?>"><?php echo($WAGLOBAL_Root_URL); ?>users_Confirm.php?ID=<?php echo($row_WAATKusers['UserID']); ?>&code=<?php echo($row_WAATKusers['UserVerificationCode']); ?></a>
but this will increase the risk of the email being trapped as spam.
As for you other question, It looks like Eric has answered the other thread you started.