Have you chosen a mechanism for saving your local TW file?
If you click on the download/save link for tesis, you can save it to your download directory. Then, for instance, if you have PMario's TiddlyBackup/file-backups installed, you can go into the "saver" part of the configuration screen and remove the tiddlyspot name and then save locally.
That is a very old edition. Unless it is working *exactly* the way you want, you should consider updating it to 5.1.19 before continuing.
Good luck
-- Mark