W3C validator Link to validator
Just go to Google and lookup W3c validator.
Copy and paste your web address into it.
PLEASE BACKUP BEFORE MAKING ANY CHANGES!
The errors were:
Line 325, Column 17: character “&” is the first character of a delimiter but occurred as data
Line 327, Column 18: character “&” is the first character of a delimiter but occurred as data
Line 329, Column 59: character “&” is the first character of a delimiter but occurred as data
Line 334, Column 9: ID “wpjb_widget_alerts” already defined
Line 279, Column 10: ID “wpjb_widget_alerts” first defined here
Line 375, Column 108: character “&” is the first character of a delimiter but occurred as data
Line 375, Column 135: end tag for “a” omitted, but OMITTAG NO was specified
Line 375, Column 42: start tag was here