I'm not able to edit a shapefile table, why? Thanks

[FernandoTello1]

The "Add field" (or Remove field) option is not showing

[DanPatterson_Retired]

permissions? Edit features—ArcGIS Online Help | ArcGIS  and Work with fields—ArcGIS Online Help | ArcGIS

[FernandoTello1]

I'm Administrator, but I got the 60 day trial period, u think it's some kind of buying full version?