I need help on custom generation on my server ASAP

Im new to aternos, and im trying to custom generate a world with a mod for custom generation can someone please help me use the custom generation, i tried multiple ways and i dont know how to use the custome generation can someone help me, if you need to know the modpack its RTG

thats what i did, but i need the generation, when i go back and upload it to server, and go on, i go to a place that has not been generated and it generates vanilla

bruh, i wrote it clear enough and i already got it fixed