ZyXEL Communications NSA210 - Manual (Page 427)

Appendix D Importing Certificates
NSA210 User’s Guide
427
3 In the Certificates manager, select the Authorities tab, select the certificate
that you want to remove, and then click Delete.
Figure 236 Opera 9: Certificate manager
4 The next time you go to the web site that issued the public key certificate you just
removed, a certification error appears.
Note: There is no confirmation when you delete a certificate authority, so be
absolutely certain that you want to go through with it before clicking the button.