new fields (add vs. change) - under free zoho version

new fields (add vs. change) - under free zoho version

as i understand a free version does not allow users add fields into accounts, contacts etc.

however, the standand free version contains unnecessary (for me, at least) fields which i would like to change (as I can't add new fields) . So is thre any way to change some of the fields (including the field name and its parameters)?