Search engine URL Submission automation

So i built a search engine to accompany my companies social network. The search engine is called www.mymegalo.com now i have a manual url entry option and i need a way to automate URL entry at link https://www.mymegalo.com/index.php?a=addurl

Now i need a way to crawl other search engines and enter the websites crawled to the search engine i built. This search engine has 40.000 search results currently and I need 1 million before it goes public with the web browser im building. Anyone have a solution. How does mojeek and duck duck go get results. Thanks.