Click the Insert/Edit Link icon (it looks like a chain) on the toolbar.
To link to a page in the UCL Wiki, search e.g. Global Spaces for the page. Click the link and click OK. (Attachments are included in the search.)
To link to a page on the Internet, click on the External Link tab and enter the address. (It may be safest to copy the address from your browser's Address field).
To link to an e-mail address, click on the External Link tab and enter _mailto:_ followed immediately by the address.
How do I add an image?
Click the Insert/Edit Image icon (it looks like mountains) on the toolbar. Click Browse to locate the file. In fact images displayed in Confluence pages are attached to the page and you can see them on the Attachments tab.
You can also create your own groups and add people to them by clicking on the Browse Space link and then on the Manage Users/Groups tab. It is better to use this feature, rather than granting permission to individuals, as it is a lot less work if you ever need to change the permissions in future.