FATAL ERROR MESSAGE / UNABLE TO EDIT WEBPAGES

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We have received the following message when trying to edit select webpages on our sitehttp://www.bringyourownbaby.com:

Fatal error: Maximum execution time of 30 seconds exceeded in /home6/bringyo7/public_html/concrete/core/models/page.php on line 905

We urgently need to change some information listed. Please can you advise what we should do?

bringyourownbaby