Amendment footer

Hi everybody I'm using the free WordPress Theme Adventurous since 2017. In the footer section I have the following information: copyright © 2017 N-Bahn Club Watt in Höri - NBC Alle Rechte vorbehalten - Adventurous Theme by Catch Themes Now I would like to make changes as folows: #1 OLD: copyright © 2017 NEW: copyright © 2017 - 2021 #2 OLD: N-Bahn Club Watt in Höri NEW N-Bahn Club (Watt) in Regensdorf - NBC Alle Rechte vorbehalten - Adventurous Theme by Catch Themes How can I do this? Note, I have "only" the free version, but obviously in 2017 it was possible to change the footer... Thanks for your helpful answers Andreas www.nbahnclub.ch