1. Login to https://portal.ultradns.com
2. Click Domains
3. Click on the <domain> that you wish to edit
3. Make any needed changes from the Records tab
4. Click the DNSSEC tab and then click RE-SIGN
On-the-fly zones do not to be re-signed by us because they are re-signed every time a DNS query comes in.
Re-signing does not break DNSSEC resolution.
Un-signing a zone (that has DS records at registrar) will break resolution.