Thank you for coming to the community with your question! Our editor does not currently support the blink tag. I have however seen a number of people insert .gif images of headlines, which then include that kind of blinking text you're talking about, for example:
Some more information on how to make a .gif image like this, and how to insert it into a campaign can be found here.
Aaron H Community & Social Media Support
Did I answer your question? If so, please mark my post as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.
You can post a new message in the Community or find us on Twitter Mon-Fri 8am-8pm ET, Sat 10am-8pm ET, & Sun 10am-6pm ET. We've got real people waiting to help you out. Click below to start a conversation!