Answer
TiddlyWiki is a little different to other Wikis you may have encountered before. Most wikis run on a server and the code to save your changes is server code. TiddlyWiki is different. It runs entirely in your web browser. All the code to save your changes is written in Javascript and contained in the TiddlyWiki file. To save changes your browser must be able to write to local disk using javascript. This means you can only edit and save changes to a TiddlyWiki file that is on a local disk. If you put your TiddlyWiki file on your web site any changes made to it can't be saved.
(TODO, explain the "HideEditFeaturesOverHttp" or link to explanation)
(This can be a useful way to publish a web site. You can edit and save your site to your local TiddlyWiki file on your local disk. When it's finished simply upload the file for the rest of the world to see).
The above information applies to a standard, off-the-shelf TiddlyWiki. However, there are some ways you can get an editable/saveable TiddlyWiki via the web.
Options for making TiddlyWiki editable/saveable via the web
There are a Multi-User Collaboration of Server-Side_Implementations that make it possible to save over HTTP.
Alternatively, a hosted service like Tiddlyspot can be used for convenience.
Category:FAQ
Category:Getting Started