Share content with Tumblr automatically

I am using www.ads-software.com for my site. The site is located at an account at a large webhost.

At another site I have at wordpress.com I have connected the site with Tumblr. This function was built into the free wordpress.com account I am using. At least I think it was there from the beginning. I connected the posting page at this site to Tumblr. When I made a post at the posting page at my site it was automatically posted at my Tumblr site too.

I want to do the same thing with the site I am using www.ads-software.com with. But this function doesn′t seem to be built into www.ads-software.com like it is into free wordpress.com accounts.

What do I have to do to get the same function with my www.ads-software.com driven site?