The server domain is brimmermc.com.
The server is running on the most recent version of Minecraft. It has plugins that allow almost any client version to join, but you will have the best experience on the most recent version.
On the multiplayer screen, click Add Server or Direct Connection. Then enter brimmermc.com into the appropriate box and join the server!
The server has a plugin called https://geysermc.org that allows Bedrock players to join the Java server. On the servers screen, if you see an Add Server button, click it, enter the server address brimmermc.com, leave the port as 19132, and join the server!
If you do not see that button, follow the steps on this page to bypass this Minecraft restriction by changing network settings to connect to the server. When you change the settings and join one of the default servers, enter the domain brimmermc.com and port 19132 to join the server!