Some articles may be too short to Zing.  Zings are about 100 words, so it may not make sense to Zing a 200 word article.

If you have enabled your Website Zing Automations, then click on "Zing Automations" on your left menu towards the bottom. 

Your Website Zing Automation screen will now have a field where you can set the minimum length an article must be to be automatically Zinged.

The minimum length is 300 words, but you can change it do a different number and clicking on the "Update" button.  This change will go into effect for all future Zings (it does not change articles that have already been Zinged.)