Here's a simple guide on how you to search a room in Raid Battle.
1. Open your Brave Frontier app and tap the Raid Battle menu.
2. After opening you will be brought to the Raid Battle home page, enter WORLD1.
3. In order to search for a room, tap Search for Room
4. After you click Search for Room, room settings will appear. Indicate the Playing Style, Quest and lowest RC. You can also leave it unspecified and tap Search.
5. Choose and tap the room you would want to enter, you can also hit Refresh button.
6. You will be asked if you want to Join the Room, tap Yes to enter the Room. Otherwise, no.
If you want to know more about Raid Battle, you can check our articles here