Error Mesages on line 64 and 897

I am in the process of setting up my website called “Removeblackheadsnow.com” using WordPress
and I am getting the following error / warning messages.

Warning: Cannot modify header information – headers already sent by (output started at
/home/kered25/public_html/wp-content/plugins/wp-insert/includes/privacypolicy.php:207)
in /home/kered25/public_html/wp-content/plugins/w3-total-cache/lib/W3/Referrer.php on line 64

Warning: Cannot modify header information – headers already sent by (output started at
/home/kered25/public_html/wp-content/plugins/wp-insert/includes/privacypolicy.php:207)
in /home/kered25/public_html/wp-includes/pluggable.php on line 897.

They are, I think, something to do with the plug-ins. Are they serious or can I
safely ignore them? If I cannot ignore them, how do I correct the errors?