Adding a picture is just like adding an attachment. You can either attach it first and then insert it where you want it to appear, or you can simply drag and drop it from wherever it is saved on your computer. You can also insert an image that is already attached to another page elsewhere on the wikis. To do this, go to Insert in the editing toolbar and choose imgae from the dropdown list. A popup box will appear allowing you to browse or search for the image.
Once inserted or dropped into place, you can click on your image to bring up a menu that will enable you to change its size, add a border, make it into a clickable link, etc. The properties button allows you to add special effects such as a shadow or picture-frame effect, or to include a caption.
Adding a slideshow is very similar to adding an image. If you simply drag and drop it then it will appear as a slideshow that can be navigated on the page. You can also attach it and just make a link to it. The following illustrates these two alternatives:
1) A slideshow on the page:
2) a link to an attached .ppt or .pptx file:
To add a table, choose Table from the editing toolbar and select the number of rows and columns that you think you will need:
When you create a table, a new toolbar appears enabling you to add or delete rows and columns, merge cells, change cell colours, etc. Hover over any of these options to see what it does: