How to: 

Create your own space

create a link within the wiki

create a link to an outside site

invite someone to view or edit your private space

adjust the frequency of emails

insert (or rather add) an image on a page

make sure your image is not too big (if you simply resize a very big image by dragging it to the size you want then the image will "unroll" rather than just "appear" and your page will be too heavy.)