Marriage data input

Marriage data go into the Relationships tab. If you can't see it this means you don't have the right to edit relationships for that profile. If it's a public profile collaborating with the manager will overcome this, if private profile you can ask the manager or a curator to do it for you.

Thanks. I'm the manager, so this is why I was confused. I'll check again and see if anyone else is managing the profile.

How do you contact a curator? Thanks again for your help.

If the profile shows you as a Manager, you should be able to edit that. Does not matter if others are as well -
If it shows you as a Manager, and you can't, it is a bug - possibly temporary, so check again if still a problem.
If it used to show you, but the person joined Geni and is now fully-claimed - then it will no longer show you as a Manager, and you will not be able to edit the Profile any longer - not Marriage dates, not anything.

Oton is a Curator.

As a general rule, if you have a problem that needs a Curator's help, posting in https://www.geni.com/discussions/178003 will get you that help.