The icons to the rules and announcements

[deep hill]

i believe you need to make the server a community server or something. idk how to do that though

[whole locust]

yep make the server a community server like bagels said and u can select new channels as announcements

and for already existing ones just click on edit channel and enable this from overview settings

[teal pebble]

community server, then you need to mark it as a rules channel and an announcement respectively

[raw cove]

Thanks for the responses, it worked