if you not see how to kill green sime quick recap
go to server and get zenith, then killed the slim by click on him
but how i kill blue slime you may be ask yourself???
let me show you
1. leave the world you kiled the green
2. delet it
3. join item server
4. get all potion
5. make world
6. press b
7. fined the blue slime
8. clik on him
9.congratu lation you have commited murdere

not a lot changed
but we kiled the mon lord