Mailchimp Subscription Plus

Hello,

I had the plugin Mailchimp Subscription Plus running on my theme and it worked just fine. But tonight I found a plugin whose look I liked more, so I installed it, connected it to my Mailchimp account and then de-activated my Mailchimp Subscription Plus plugin. In the place where the subscription box used to sit on my site, now there’s an error:

[FWSSubscriptionForm extramergefield=”via blog post” title=”Join Our Email List” description=”Subscribe now and get artsy stuff in your inbox.”]

I thought maybe the plugin was still interacting badly with another plugin, so I deleted it, but the error is still there.

Here’s my website: https://www.amberwingart.com
The new plugin and the error are on all of my pages except the gallery/Portfolio pages. Here’s a page where you can see the error:

https://www.amberwingart.com/commissions/

Any help you can give would be greatly appreciated!