To delete a room:

Remove it manually from the Room_List attribute.

Then clear it from the code itself by typing:

&ROOMNAME_blah here=
and
&ROOMDESC_blah here=

That will clear it from the code.

Example:

Examining the TP room shows you this under ROOM_LIST

ROOM_LIST: FSH_Fort Sea Hold|Stonehaven_Stonehaven Cothold|Gold_Gold Hill Hold|Test_4|

You would enter the list as:

&room_list here=FSH_Fort Sea Hold|Stonehaven_Stonehaven Cothold|Gold_Gold Hill Hold|

Then:
&roomname_test here=
&roomdesc_test here=

That will remove the Test room from the 'list rooms' and delete it from the code completely.