therez nothing copmplicated for merging pics-
.if u wanna merge two pics...open the first one nd there will be a tab on the upp-er side named "layer" click on that nd select "open image as layer" nd oppen the second pic u wanna merge...then u'll get the second pic on the first one thn just go to edit nd free transform...nd move it thn use eraser to make it like a maerge one π