How do i change a picture in a page in wikipedia?

I know about the %26quot;edit page.%26quot; I know what to do with text, but how do i change an image?

Plz be clear.How do i change a picture in a page in wikipedia?
place the following text on the edit page of the topic.



[[Image:imagename.jpg|thumb|

right |Caption|150px]]



after you have saved that then click the link and upload the picture. u need to abide by image laws which will be appear.



imagename : is the name of file which may on your system.

right : alignment of the image,

Caption : you can write about the image

150X : size of the image





e.g.

[[Image:Shrine Abbas Karbala.jpg|thumb|right|Shrine of Abbas ibn Ali ibn Abu Talib|150px]]How do i change a picture in a page in wikipedia?
http://en.wikipedia.org/wiki/Wikipedia:I



Clear guide hereHow do i change a picture in a page in wikipedia?
Save the image, edit it and then upload it under the same name...?