From Official Wiki of the Renaissance Kingdoms

You can find "Your duties and responsibilities" menu on your Character sheet, in the bottom, if you are an elected official (council member, Mayor, Harbormaster), or if you have received a grant.

If you are an elected official, this is where you'll find the option to Resign. Attention: that action cannot be reversed, and it's of immediate action once you click it.

If you aren't an elected official, but you receive Grants, you will also have this menu available. Once you select "Your duties and responsibilities", you will see who issued the grant, and you can select "See", to both see the grant and find the option to either Accept that grant or Decline it.