5. Download Paper, rename paper-1.21.4-222 to server.jar and run it somewhere in the root of the drive. If the Java version is correct, the server will start without errors but stop at the EULA agreement step. Close the console, find the eula.txt file in the server folder. Open it and find the line eula=false. Change it to eula=true and save the file. Place the two plugins above in the Plugins folder.
6. In the plugins folder go to ServerTap and open config.yml - change useKeyAuth: true to useKeyAuth: false.
7. Download Minecraft Java edition with the same version as Paper. Currently it's 1.24.
Start the server via start.bat and make yourself admin. In the console directly type the command op YOURNICK. This will allow you to execute commands on the server.
If you have a pirated version of Minecraft, in the server folder find the file "server.properties" and change the line online-mode=true to online-mode=false. Save and restart the server.
If everything is correct, the server console won't show errors. And the widget page will be able to connect to it and test commands.
Since you have the TNT plugin you can use these commands to spawn TNT: