OK, here is the complete process, based on Wes' explanation:
1. Download Putty. You can get it here:
http://www.chiark.greenend.org.uk/~sgtatham/putty/2. Run Putty and login to crawl.develz.org via Telnet, port 345
3. Login using your WebTile login & password
4. Select 1 (Crawl 0.8)
5. Select o (edit options)
6. Scroll down to the bottom and paste this in (right mouse click worked for me as the paste command):
travel_stop_message = duration:
force_more_message = duration:
travel_stop_message = You are starting to lose your buoyancy
force_more_message = You are starting to lose your buoyancy
travel_stop_message = You have a feeling this form
force_more_message = You have a feeling this form
message_colour = lightred:You have a feeling this form
travel_stop_message = Your transformation
force_more_message = Your transformation
message_colour = lightred:Your transformation
travel_stop_message = You feel uncertain
force_more_message = You feel uncertain
travel_stop_message = Your deflect missiles
force_more_message = Your deflect missiles
7. Save, exit, and go enjoy WebTiles!