Maybe there's no slot for new room. There can be 185 servers (check upper right corner) and new can't be created. So you must try again and once ppl leave some server so you can take that slot.
[re] | #Polska qui hic minxerit aut cacaverit, habeat deos superos et inferos iratos
You must be room operator, so have a @ next to your nick, so it'll look:
@dannyssj4
^like that.
When you've got this, you can change mod in 2 ways:
1. command /set mod ExcactName.tbm (case sensitive)
2. ctrl+ m and select mod you wish to load, much easier
[re] | #Polska qui hic minxerit aut cacaverit, habeat deos superos et inferos iratos