More on Wiki

So here I am again....trying to get through the activities and wrap my head around the technology we are using.
A couple of weeks ago I placed a photo on my Wkik homepage....unfortunantly a little too fast as I had not yet learnt that I needed to re-size the picture first....Now I have an enormous picture of a horeses head (Bronco's logo) on my Wiki's front page and I can not seem to edit, delete or resize.  I went into pages and files and deleted the home page thinking that would do the trick, but alas it deleted the text and embedded you-tube but not the hideous horses head. Fortunantly, wiki has it's own recycle bin so it was very easy to restore the lost data......On reflection I should have used the preview button before saving the picture as my home page image...
Additionally, I made a movie using my webcam and movie maker and uploaded to my wiki. Although it didn't do what I thought it would. I thought it would place itself on the screen just like the embedded you tube clip, however, the movie was placed on a page and needs to be downloaded to be viewed. Not sure if this is right , although, I am happy that it worked as I ahve never done anything like that before...