Is it possible to edit custom fields in the free version

Is it possible to edit custom fields in the free version

I am currently testing Zoho CRM with the free version, only just starting. I have added custom fields in Contacts. It doesn't seem to be possible to edit the label or a multiselect list, or anything at all. Can't delete custom fields either, I can just remove them. Is it because it's the free version???? Or am I missing something?