Mailchimp Tags in BB Subscribe Form module

I have successfully connected the BB Subscribe Form module to Mailchimp.

Via the BB Subscribe Form module, I’m wondering if it’s possible to have a Mailchimp ‘Tag’ passed onto Mailchimp - so that I can segment the subscription.

I have other Gravity Forms on the same website - each successfully passing a Tag onto Mailchimp. However the BB Subscription Form module looks very elegant and I wish to use it in a couple of instances.

How do you add the css from MailChimp to BB? I went into my site blog page and selected Layout css & Java Script. After cut and paste from MailChimp, error warning is not allowed.