trill ending

How can I add a springer (end of trill)?

I’m sorry, I don’t know what a “springer” is. Do you mean the grace notes often found at the end of a trill, sometimes known as nachschlag?

Yes, how do you add a Nachschlag?

Might be a solution?
https://www.dropbox.com/s/hh2skj6vo8bxss1/Nachschlag.mov?dl=0

I just discovered that, too. It’s nice the way Dorico reformats.