Useful information:
Every PBworks page has an edit tab, so you can easily edit workspace pages. The PBworks editor is as easy to use as most online editors. Just click "Edit" on any page to edit the page:
When a page is in edit mode, the content of the page can be manipulated by the keyboard. In addition to an editor toolbar appearing along the top of the page, "Save" and "Save and Continue" buttons appear at the bottom. Also, the Page Tools right panel appears at the right hand side, with a useful tool to automatically insert links of pages and files. You'll also use this panel to upload new files to your workspace (without having to get out of edit mode).
Changes are only saved permanently when the Save button in the lower left corner is clicked.
More information:
How to insert images and files.
How to insert a link.
How to insert plugins.