If you are a parishioner, but have an activity in the parish such as Catechist, you must request access to your parish priest in order to access and manage your catechesis groups.
If you have another role in the Parish, such as Treasurer or Assistant, you should request access to the Parish Priest.
If you just want to be informed about the news in your parish, then you should consult the parish website or the Kyrios App, defining your Parish.