No worries, the error will give you a clue as to where to look.
the error you reported was:
Warning: Cannot modify header information - headers already sent by (output started at /home/mich0899/public_html/ RTAPI_members_EmailPW.php:2) in /home/mich0899/public_html/ WA_SecurityAssist/Helper_PHP.php on line 107
the part in perenthesis talks about the output causing the problem:
(output started at /home/mich0899/public_html/ RTAPI_members_EmailPW.php:2)
this means line 2 of the RTAPI_members_EmailPW.php file. usually, the line reported is the one after the line causing the problem, this is what triggered me to look directly at line 1 for the problem.