Hello yiyu jia,
First you have to setup cronjob in your server and follow this documentation ->
http://stackideas.com/docs/easyblog/how-tos/138-setting-up-cronjobs-in-cpanel
Second you have to enter your mail server details in Easyblog remote publishing particular field and save it.
After that click on the "Test connection" and see is it connected?
If you need further assistance, you can provide us with your Joomla backend and Cpanel access so we can help you configure with this.
I would personally prefer that you start a new thread instead and
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