check your server.cfg and also make sure you are editing your active profile for the server. (Looks like Multiplay is your host) DO NOT EDIT THE VALUES WITH $$command$$ that is scripted by your hosting provider to use the name and password fields on the page. It will auto input that information into the file.
Sleepers in normally on so you do not have to specify this.
In the server.cfg file add the follow line:
Then save this file and restart your server. If all went well you should have instacraft.
If you are using oxide you have to edit oxides server configuration file with the same command above.
Also some other helpful commands…
env.time 12 (makes the time in the server noon)
env.timecale 0.000000000000000 (Makes the server time stay day)