That function is defined in the WA_SecurityAssist/Helper_PHP.php file. make sure that the following is near line one of your login page:
<?php require_once( "WA_SecurityAssist/Helper_PHP.php" ); ?>
The power store pages are connected to a template. along the left hand side, it will show the products available from the products table.
The login itself will connect to the Users table, this error is not occurring on the login process though.
The registration email is configured as a plain text email. This is to combat the possibility of the email being trapped in a spam filter. Most modern Email clients like Thunderbird or even gmail will parse the URL and display it as a link, in some email clients, though, it will not be displayed as a link. In this case, you will need to copy and paste it to your browsers window.
If you have Menu Writer v2, you can edit the power store store menu and add links to the pages you add.
You have full controll over how the captcha looks by modifying the following setting in the WA_Globals:
$WAGLOBAL_Captcha_Width = "255" ;
$WAGLOBAL_Captcha_Height = "40" ;
$WAGLOBAL_Captcha_Characters = "5" ;
$WAGLOBAL_Captcha_Font = "Fonts/MOM_T___.TTF" ;
$WAGLOBAL_Captcha_BG = "F0F0F0" ;
$WAGLOBAL_Captcha_Noise = "F0F0F0" ;
$WAGLOBAL_Captcha_Text = "000000" ;
$WAGLOBAL_Captcha_BG_transparent = "0" ;
you can change the background an noise to something with more contrast, like:
$WAGLOBAL_Captcha_BG = "3399CC" ;
$WAGLOBAL_Captcha_Noise = "FF0000" ;
Play with those colors to come up with whatever works for you.
See the color chart here for reference: