ID picture - change picture of theme

In the template (theme Carpenter) , the gallery is set as follows: 
[gallery link = "file" size = "full" style = "masonry" ids = "19,20,21,23,24,22,26,25,18"]    
How do I change photos? How do I assign them an ID? Where can I edit?
http://www.ing3d.cz/home2/ 

Thanks

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