Hi @hi2019,
There is no automatic way of exporting content from Wordpress to OJS. The methods of importing for OJS are outlined here:
https://docs.pkp.sfu.ca/learning-ojs/en/tools#importexport
Some folks here on the forum have discussed integrations between WordPress and, OJS, so you might find some clues buried in other threads, like these: Wordpress XML import or by searching on the forum.
I wasn’t able to access your site through the link provided - it just gave a blank page, so I couldn’t see how much content you have. If you only have a little bit of content, you may want to consider, the quick submit method. However, if you have a larger amount of content, you may want to consider the XML import - there is, however, a learning curve associated with that.
-Roger
PKP Team