Help me open an URL in POP - UP , the URL is stored in a Salesforce Custom Field.

Nikita,

The HTML in your template looks good.  I would check 3 other things.  First, check the Field security settings, make sure that you have Read access to the field.  Second, put the field on your page somewhere to make sure that you have a URL in the field.  Use a Template ‘field’ and drop the field using the triple mustache.  Lastly, copy the field value from your page and try opening the URL in another tab/window.

Thanks,

Bill