Help:How to Edit
To edit, press the Edit button to the right of the title of the page or section you wish to edit. Highlight a word and press the chain button at the top left corner of the Visual editor to add a Hyperlink; if you wish to change what the link is or the text displayed, write in the info in the correct box. The buttons for italics and bold are found in the same place. Features, media and templates can be added by selecting them from the panel at the right, and Categories can be added by typing them in the Add Category box in the same panel. Press preview to view what the page will look like when you publish it and press publish to save your changes.
You can also switch to Source mode by pressing the Source tab next to Visual at the top of the page. Source mode is necessary for advanced templates, but you will have to add links, change to bold font, etc. manually, which will require symbols on either side.