1

First Step

Log in to your Wepwawet Control Panel and select your Server

2

Second Step

Stop your server.

3

Third Step

Under the General tab, Click on Files, Then select world, world_the_nether and world_the_end and click on the Delete button at the top.

4

Fourth Step

After that, Click on the server.properties file and go to the line level-seed=[seed] and change [seed] to your prefered seed that you’d like to make your world.

5

Fifth Step

Click on Save Content or press CTRL+S

6

Sixth Step

Under General tab, Click on Console and Start the server.

There you go your server now has a new world with your new custom seed!
Miscellaneous Settings in server.propertiesHow to increase Player Capacity